Well, I post a topic (event) and assign it to the calendar. Like: post in this topic if you want to join this and this event.
The topic is posted and neatly displayed in the calendar. Now some people reply and suddenly the event has disappeared from the calendar.
First I thought the issue was caused by the original posters of the topic: they maintain a list with participants in the first posting of the thread, regularly editing it. I thought they forgot to re-tick the calendar box during the re-post. However, I just checked and now an event has disappeared from the calendar after someone replied to it. The first posting in said thread was not edited by the topic starter since the last time I re-added said event to the calendar.
I.e. apparently, postings disappear from the calendar after people reply to it.
