diff --git a/install/INSTALL.md b/install/INSTALL.md
index 2b3ca7f..f9a5be2 100644
--- a/install/INSTALL.md
+++ b/install/INSTALL.md
@@ -96,6 +96,7 @@ apt-get install <deb-package>
     libmime-tools-perl
     libsession-token-perl
     libtext-multimarkdown-perl
+    libtext-unidecode
     libtext-wikicreole-perl
     liburi-escape-xs-perl
     perlmagick
diff --git a/install/create.sql b/install/create.sql
index 803dfa0..ca93986 100644
--- a/install/create.sql
+++ b/install/create.sql
@@ -1816,3 +1816,5 @@ CHANGE COLUMN `email` `email` VARCHAR(100) NULL DEFAULT NULL ;
 
 ALTER TABLE `calcms`.`calcms_user_selected_events`
 CHANGE COLUMN `user` `user` VARCHAR(100) NOT NULL ;
+
+CREATE INDEX idx_covering ON calcms_events (start, end, id);
\ No newline at end of file
diff --git a/install/migrate.sql b/install/migrate.sql
index d788558..11dc0c3 100644
--- a/install/migrate.sql
+++ b/install/migrate.sql
@@ -361,4 +361,6 @@ ADD COLUMN `week_of_month` INT UNSIGNED NULL AFTER `weekday`,
 ADD COLUMN `month` INT UNSIGNED NULL AFTER `week_of_month`,
 CHANGE COLUMN `frequency` `frequency` INT UNSIGNED NULL ;
 
-update `calcms_studio_timeslot_schedule` set period_type = 'days' where period_type = '';
\ No newline at end of file
+update `calcms_studio_timeslot_schedule` set period_type = 'days' where period_type = '';
+
+CREATE INDEX idx_covering ON calcms_events (start, end, id);
\ No newline at end of file
diff --git a/lib/calcms/events.pm b/lib/calcms/events.pm
index 198030d..f6e8121 100644
--- a/lib/calcms/events.pm
+++ b/lib/calcms/events.pm
@@ -533,7 +533,7 @@ sub get_listen_key($$){
     my $archive_dir = $config->{locations}->{local_archive_dir};
     my $archive_url = $config->{locations}->{listen_url};
     return $event->{listen_url} = $archive_url . '/' . $event->{listen_key} if 
-        defined $event->{listen_key} and -l $archive_dir .'/'. $event->{listen_key};
+        defined $event->{listen_key} && -l $archive_dir .'/'. $event->{listen_key};
     set_listen_key($config, $event) unless $event->{listen_key};
 }
 
diff --git a/lib/calcms/mail.pm b/lib/calcms/mail.pm
index 0ae856d..fb09583 100644
--- a/lib/calcms/mail.pm
+++ b/lib/calcms/mail.pm
@@ -3,11 +3,27 @@ package mail;
 use strict;
 use warnings;
 no warnings 'redefine';
+use utf8;
 
 use Email::Sender::Simple();
 use Email::Simple();
-use MIME::Words qw(encode_mimeword);
-use MIME::QuotedPrint qw(encode_qp);
+use Text::Unidecode qw(unidecode);
+
+sub to_ascii {
+    my ($s) = @_;
+    my %translate = qw(
+        Ä Ae
+        ä ae
+        Ö Oe
+        ö oe
+        Ü Ue
+        ü ue
+        ß ss
+    );
+    $s =~ s/([ÄäÖöÜüß])/$translate{$1}/g;
+    $s = unidecode $s;
+    return $s;
+}
 
 sub send($) {
     my ($mail) = @_;
@@ -15,14 +31,13 @@ sub send($) {
     my $email = Email::Simple->create(
         header => [
             'Content-Type' => 'text/plain;',
-            'Content-Transfer-Encoding' => 'quoted-printable',
             'From'     => $mail->{'From'},
             'To'       => $mail->{'To'},
             'Cc'       => $mail->{'Cc'},
             'Reply-To' => $mail->{'Reply-To'},
-            'Subject'  => encode_mimeword($mail->{'Subject'}, 'b', 'UTF-8')
+			'Subject' => to_ascii($mail->{'Subject'})
         ],
-        body => encode_qp($mail->{'Data'}),
+        body => to_ascii($mail->{'Data'})
     );
     Email::Sender::Simple->send($email);
 }
diff --git a/lib/calcms/series_dates.pm b/lib/calcms/series_dates.pm
index d7be3de..feceb95 100644
--- a/lib/calcms/series_dates.pm
+++ b/lib/calcms/series_dates.pm
@@ -521,7 +521,7 @@ sub delete ($$) {
 sub getDatesWithoutEvent ($$) {
     my ($config, $options) = @_;
 
-    for ('project_id', 'studio_id', 'form', 'till') {
+    for ('project_id', 'studio_id', 'from', 'till') {
         return unless defined $options->{$_}
     };
 
diff --git a/lib/calcms/user_sessions.pm b/lib/calcms/user_sessions.pm
index 965d2da..fd3f053 100644
--- a/lib/calcms/user_sessions.pm
+++ b/lib/calcms/user_sessions.pm
@@ -86,9 +86,11 @@ sub insert ($$) {
 
     $entry->{pid}        = $$;
     $entry->{expires_at} = time::time_to_datetime( time() + $entry->{timeout} );
-
+    $config->{access}->{write} = 1;
     my $dbh = db::connect($config);
-    return db::insert( $dbh, 'calcms_user_sessions', $entry );
+    my $result =  db::insert( $dbh, 'calcms_user_sessions', $entry );
+    $config->{access}->{write} = 0;
+    return $result;
 }
 
 # start session and return generated session id
@@ -176,6 +178,7 @@ sub update ($$) {
 
     return undef unless defined $entry->{session_id};
 
+    $config->{access}->{write} = 1;
     my $dbh         = db::connect($config);
     my @keys        = sort keys %$entry;
     my $values      = join( ",", map { $_ . '=?' } @keys );
@@ -187,7 +190,9 @@ sub update ($$) {
         set    $values
         where  session_id=?
     };
-    return db::put( $dbh, $query, \@bind_values );
+    my $result = db::put( $dbh, $query, \@bind_values );
+    $config->{access}->{write} = 0;
+    return $result;
 }
 
 #map schedule id to id
diff --git a/website/agenda/css/calcms.css b/website/agenda/css/calcms.css
index d38cf85..bfb85d8 100644
--- a/website/agenda/css/calcms.css
+++ b/website/agenda/css/calcms.css
@@ -1,7 +1,49 @@
-/*
-include in your web page:
-<link rel="stylesheet" type="text/css" media="screen" href="/agenda_files/css/calcms.css" />
-*/
+* {
+    border-radius:4px;
+}
+
+@font-face {
+    font-family: 'Roboto';
+    font-style: normal;
+    font-weight: 400;
+    src: local('Roboto'), local('Roboto-Regular'),
+       url('../fonts/roboto-v18-latin_latin-ext-regular.woff2') format('woff2'),
+}
+
+@font-face {
+    font-family: 'Open Sans';
+    font-style: normal;
+    font-weight: 400;
+    src: local('Open Sans Regular'), local('OpenSans-Regular'),
+       url('../fonts/open-sans-v15-latin_latin-ext-regular.woff2') format('woff2'),
+}
+
+@media (prefers-color-scheme: dark) {
+    html,
+    *,
+    .entry-title a,
+    #calcms_calendar table thead a:hover,
+    #calcms_calendar table thead a:link,
+    .main-navigation a:hover, 
+    .main-navigation a:focus
+    {
+        color:white !important;
+        background:black !important;
+    }
+
+    #calcms_list h1.summary{
+        background: none !important;
+    }
+    
+    a.load-prev, a.load-next{
+        color:#999 !important;
+        background:#333 !important;
+    }
+    
+    img.custom-logo{
+        filter: invert(1);
+    }
+}
 
 /* fix drupal */
 input{
@@ -676,23 +718,3 @@ ul.mobileMenu li a:hover{
     line-height:2em;
 }
 
-/*
-pre{
-	text-align:left;
-	font-family:Courier;
-	padding:1em;
-	margin:1em;
-	border:1px solid black;
-}
-
-div.update{
-	position:absolute;
-	bottom:0px;
-}
-
-div.update, div.update a{
-	text-align:left;
-	font-size:6px;
-	color:#bbb;
-}
-*/
diff --git a/website/agenda/planung/create-events.cgi b/website/agenda/planung/create-events.cgi
index bd3e5a0..259c7fb 100755
--- a/website/agenda/planung/create-events.cgi
+++ b/website/agenda/planung/create-events.cgi
@@ -29,7 +29,6 @@ my $config = config::get('../config/config.cgi');
 my ( $user, $expires ) = auth::get_user( $config, $params, $cgi );
 return if ( ( !defined $user ) || ( $user eq '' ) );
 
-#print STDERR $params->{project_id}."\n";
 my $user_presets = uac::get_user_presets(
     $config,
     {
@@ -42,7 +41,6 @@ $params->{default_studio_id} = $user_presets->{studio_id};
 $params = uac::setDefaultStudio( $params, $user_presets );
 $params = uac::setDefaultProject( $params, $user_presets );
 
-#print STDERR $params->{project_id}."\n";
 my $request = {
     url => $ENV{QUERY_STRING} || '',
     params => {
@@ -80,7 +78,6 @@ sub show_events {
         uac::permissions_denied('read_events');
         return;
     }
-
     my $events = getDates( $config, $request );
     $params->{events} = $events;
     $params->{total}  = scalar(@$events);
@@ -107,8 +104,6 @@ sub create_events {
     print STDERR "<pre>found " . ( scalar @$dates ) . " dates\n";
     my $events = [];
     for my $date (@$dates) {
-
-        #print STDERR $date->{start}."\n";
         push @$events, createEvent( $config, $request, $date );
     }
     $params->{events} = $events;
diff --git a/website/agenda/planung/css/notify-events.css b/website/agenda/planung/css/notify-events.css
index bbc21ec..68046a3 100644
--- a/website/agenda/planung/css/notify-events.css
+++ b/website/agenda/planung/css/notify-events.css
@@ -2,8 +2,19 @@ table#events{
     transition:all 2s;
 }
 
-table#events.done{
-    background:#cfc;
+table#events div.error{
+    background: #f33;
+    color:white;
+    padding:1rem;
+    width: 30rem;
+}
+
+
+table#events div.done{
+    background: #3f3;
+    color:white;
+    padding:1rem;
+    width: 30rem;
 }
 
 table#events td:nth-of-type(1){
diff --git a/website/agenda/planung/js/notify-events.js b/website/agenda/planung/js/notify-events.js
index 98d0cf1..7d430cc 100644
--- a/website/agenda/planung/js/notify-events.js
+++ b/website/agenda/planung/js/notify-events.js
@@ -1,13 +1,20 @@
 function register_buttons() {
     $("#forms form").on('click', 'button', function( event ) {
         event.preventDefault();
-        var form = $(this).closest('form');
+        let form = $(this).closest('form');
+        let formId = form.attr('id');
+        let table = $('#' + formId+" table");
+        let  status = table.find("td.result div");
+        status.text('').removeClass("error").removeClass("done");
+
         $.post("notify-events.cgi", form.serialize())
-        .done( function(data) {
-            var content = $(data).find("#content");
-            $('#result').html(content);
-            var formId = form.attr('id');
-            $('#' + formId+" table").addClass("done");
+        .always( function(data) {
+            if (data.includes("done")){
+                status.text("ok").removeClass("error").addClass("done");
+            } else {
+                status.text(data).removeClass("ok").addClass("error");
+            }
+            table.find("tr.result").show();
         });
     });
 }
diff --git a/website/agenda/planung/notify-events.cgi b/website/agenda/planung/notify-events.cgi
index 4e01d02..b72b163 100755
--- a/website/agenda/planung/notify-events.cgi
+++ b/website/agenda/planung/notify-events.cgi
@@ -6,6 +6,7 @@ no warnings 'redefine';
 use utf8;
 
 use Data::Dumper;
+use Try::Tiny;
 
 use params();
 use config();
@@ -53,11 +54,10 @@ my $request = {
 
 #set user at params->presets->user
 $request = uac::prepare_request( $request, $user_presets );
-
 $params = $request->{params}->{checked};
 
 #show header
-unless ( params::isJson() || ( $params->{template} =~ /\.txt/ ) ) {
+unless ( params::isJson() || ( $params->{template} =~ /\.txt/ ) || $params->{action}eq'send' ) {
     my $headerParams = uac::set_template_permissions( $request->{permissions}, $params );
     $headerParams->{loc} = localization::get( $config, { user => $user, file => 'menu' } );
     template::process( $config, 'print', template::check( $config, 'default.html' ), $headerParams );
@@ -162,8 +162,13 @@ sub sendMail {
     $mail->{Cc}      = $params->{cc}      if defined $params->{cc};
     $mail->{Subject} = $params->{subject} if defined $params->{subject};
     $mail->{Data}    = $params->{content} if defined $params->{content};
-    my $result = mail::send($mail);
-    print "Content-type:text/plain\n\nresult:".Dumper($result);
+
+    try {
+        my $result = mail::send($mail);
+        print "Content-type:text/plain\n\ndone:$result\n";
+    } catch {
+        printf "Content-type:text/plain\n\nresult:%s\n", $_->{message} // $_;
+    }
 }
 
 sub getMail {
@@ -214,8 +219,6 @@ sub eventToText {
     $s .= $event->{user_excerpt} . "\n";
     $s .= $event->{topic} . "\n";
     $s .= $event->{content} . "\n";
-
-    #print STDERR "DUMP\n$s";
     return $s;
 
 }
diff --git a/website/agenda/planung/pot/de/notify-events.po b/website/agenda/planung/pot/de/notify-events.po
index dc8c301..38e5eb0 100644
--- a/website/agenda/planung/pot/de/notify-events.po
+++ b/website/agenda/planung/pot/de/notify-events.po
@@ -28,3 +28,5 @@ msgstr "Inhalt"
 msgid "show_details"
 msgstr "Zeige Details"
 
+msgid "result"
+msgstr "Ergebnis"
diff --git a/website/agenda/planung/pot/en/notify-events.po b/website/agenda/planung/pot/en/notify-events.po
index a25913e..6435d03 100644
--- a/website/agenda/planung/pot/en/notify-events.po
+++ b/website/agenda/planung/pot/en/notify-events.po
@@ -28,3 +28,5 @@ msgstr "Content"
 msgid "show_details"
 msgstr "Show Details"
 
+msgid "result"
+msgstr "Result"
diff --git a/website/agenda/planung/templates/notify-events.html b/website/agenda/planung/templates/notify-events.html
index 667894b..f86d7f8 100644
--- a/website/agenda/planung/templates/notify-events.html
+++ b/website/agenda/planung/templates/notify-events.html
@@ -43,15 +43,15 @@
             <TMPL_IF playout><img src="image/play.svg" title="playout"></TMPL_IF>
         </td>
 
-    <TMPL_IF noRecipient>
+<TMPL_IF noRecipient>
         <td></td>
-        </tr>
+    </tr>
 
-        <tr>
-            <td>Warning</td>
-            <td><div class="error">no recipient configured at series!</div></td>
-        </tr>
-    <TMPL_ELSE>
+    <tr>
+        <td>Warning</td>
+        <td><div class="error">no recipient configured at series!</div></td>
+    </tr>
+<TMPL_ELSE>
         <td class="action"><button type="submit"><TMPL_VAR .loc.button_send></button></td>
     </tr>
 
@@ -63,12 +63,18 @@
     </tr>
     </TMPL_IF>
 
+    <tr class="result" style="display:none">
+        <td><TMPL_VAR .loc.result></td>
+        <td class="result"><div></div></td>
+    </tr>
+
     <TMPL_IF mail.Subject>
     <tr class="subject details">
         <td><TMPL_VAR .loc.subject></td>
         <td class="mailSubject"><input name="subject" value="<TMPL_VAR mail.Subject>"></td>
     </tr>
     </TMPL_IF>
+
     <TMPL_IF mail.From>
     <tr class="details">
         <td><TMPL_VAR .loc.from></td>
@@ -97,7 +103,7 @@
     </tr>
     </TMPL_IF>
 
-    </TMPL_IF>
+</TMPL_IF>
 </table>
 </form>
 </TMPL_LOOP>
diff --git a/website/agenda/planung/templates/studios.html b/website/agenda/planung/templates/studios.html
index 4dd5e4b..8a4b1e4 100644
--- a/website/agenda/planung/templates/studios.html
+++ b/website/agenda/planung/templates/studios.html
@@ -66,7 +66,7 @@
                     <td>
                         <button 
                             class="selectImage"
-                            onclick="selectImage('<TMPL_VAR name escape=javascript>', '<TMPL_VAR image escape=javascript>', 'studio', '<TMPL_VAR .project_id escape=js>','<TMPL_VAR .studio_id escape=js>'); return false;"
+                            onclick="selectImage('<TMPL_VAR name escape=javascript>', '<TMPL_VAR image escape=javascript>', 'studios', '<TMPL_VAR .project_id escape=js>','<TMPL_VAR .studio_id escape=js>'); return false;"
                         >
                             <img id="imagePreview" src="show-image.cgi?project_id=<TMPL_VAR .project_id escape=js>&studio_id=<TMPL_VAR .studio_id escape=js>&filename=<TMPL_VAR image escape=js>&type=icon">
                         </button>