diff --git a/events.ics b/events.ics
index 8599d50616689eca6c9464c0984a9e933998fe2d..17b61cdc2e152073cb3baf3e067043eb80c84383 100644
--- a/events.ics
+++ b/events.ics
@@ -10,7 +10,7 @@ METHOD:PUBLISH
 UID:{{ event.uid }}
 ORGANIZER;CN="Chaotikum e.V.":MAILTO:{{event.contact}}
 LOCATION:Chaotikum
-
+{% assign rounds = {{ event.short | size }} | modulo: 70 %}
 SUMMARY:{{ event.short | size }}:{{ event.short }}
 CLASS:PUBLIC
 DTSTART:{{ event.eventdate | date: "%Y%m%d" }}T{{ event.eventdate | date: "%H%M%S" }}Z