I've applied some long-coming updates to DIscourse. New features include:
Improved advanced search
(You can get at this from the "burger" menu, top right by your profile circle)
And then you can see who's in each group by clicking on it
This is just some simple scripting but there's now a button for linking to the events calendar. If you want editing rights to the calendar, just ask.
Or questions or strange behaviour? Let me know!