diff --git a/bin/check.pl b/bin/check.pl
index cb9d751d..e7d62d29 100644
--- a/bin/check.pl
+++ b/bin/check.pl
@@ -2,15 +2,12 @@
 use warnings;
 use File::Spec;
 use File::Basename;
-use lib File::Spec->catfile(
-            File::Basename::dirname(File::Spec->rel2abs($0)),
-            '..',
-            'lib');
+use lib File::Spec->catfile( File::Basename::dirname( File::Spec->rel2abs($0) ), '..', 'lib' );
 
 use Perl::Maven::Calendar;
 
 #  Verify calendar format
 # Should the dates be in order?
 
-Perl::Maven::Calendar::create_calendar(q{sites/en/events.json});
+Perl::Maven::Calendar::create_calendar( q{sites/en/events.json}, q{sites/en/old_events.json} );
 
diff --git a/lib/Perl/Maven.pm b/lib/Perl/Maven.pm
index 5d494b84..4cc98e1b 100644
--- a/lib/Perl/Maven.pm
+++ b/lib/Perl/Maven.pm
@@ -727,8 +727,9 @@ get '/sitemap.xml' => sub {
 
 get '/events.ics' => sub {
 	content_type 'text/calendar';
+	my $old_file = path( mymaven->{root}, 'sites', mymaven->{lang}, 'old_events.json' );
 	my $filepath = path( mymaven->{root}, 'sites', mymaven->{lang}, 'events.json' );
-	return Perl::Maven::Calendar::create_calendar($filepath);
+	return Perl::Maven::Calendar::create_calendar( $filepath, $old_file );
 };
 
 get '/rss/:tag' => sub {
diff --git a/lib/Perl/Maven/Calendar.pm b/lib/Perl/Maven/Calendar.pm
index 53ee12b1..6427f417 100644
--- a/lib/Perl/Maven/Calendar.pm
+++ b/lib/Perl/Maven/Calendar.pm
@@ -13,15 +13,20 @@ use Cpanel::JSON::XS qw(encode_json decode_json);
 use Path::Tiny qw(path);
 
 sub create_calendar {
-	my ($filepath) = @_;
+	my ( $filepath, $old_file ) = @_;
 
 	my $modify_time = ( stat($filepath) )[9];
 
 	my $calendar = Data::ICal->new;
 	my $changed  = DateTime->from_epoch( epoch => $modify_time );
 
-	my $events = decode_json( path($filepath)->slurp_utf8 );
-	for my $event (@$events) {
+	my @events;
+	for my $file ( $old_file, $filepath ) {
+		if ( -e $file ) {
+			push @events, @{ decode_json( path($file)->slurp_utf8 ) };
+		}
+	}
+	for my $event (@events) {
 		my $ical_event = Data::ICal::Entry::Event->new;
 		my $begin      = DateTime->new( $event->{begin} );
 		my $duration   = DateTime::Duration->new( $event->{duration} );