There is an Events type mod here that works with your calender.
When an event is posted in the calender it will automatically create a thread....
Anyway, anytime someone replies to said event it will post the comment within the events first post of that thread. Members that have RSVP'd that event can comment at any time within the first post. Only one I know of that is similar to what you ask.
Search for "Event" or "Events", All Mods, Title only (Quoted by Lynne)
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