Ideas
JonaO703
26 days agoHero
My game had something similar but not exactly like others who've posted here. I tested in an unmodded save. The X was invisible, but as crinrict mentioned in a reply, I got the X when I hovered over the event title.
The big difference for me is that when the last task (Have Toasts) was completed, the event UI vanished and it looked like the event ended.
The participant sims no longer had the group icon above their heads. The event ran from 6pm until just after midnight.