Attendees Told Active Event Had Passed

Hi!

I host a weekly travel related events through Meetup.com where all the attendees connect via Zoom.  It's worked very smoothly for years.  But last night something very strange happened.  As attendees tried to connect either via the link on the Meetup event page or with the link I sent out a few hours earlier, they were told that the "Event had passed".  Some were able to connect using different divices, but it was very strange.  I double checked the times and time zones on both Zoom and Meet-up and everything was correct.  Was there some kind of glitch?