I recall having issues with this bug when all the GMAX'S were available last year during dark skies or whatever the event was called. I spent 15 minutes getting all 20 people together, then another 15 minutes freaking out when I could only invite 10 people to RSVP even after leaving the RSVP and rejoining to invite more people. What a lovely waste of time, I don't believe this will ever get fixed as it seems like it's been in the game for over a year or two.
by ahjahgomez