For the theater troupe event at the Proscenium on Isle of Dorn, the indicator on the map will say “[show] starts at the top of the hour!”, and the listed show will always be wrong until 5 minutes before the actual start. This coincides with when players waiting at the location get the scenario startup with a 5-minute countdown.
Before the show corrects itself at that 5-minute mark, it always lists what last hour’s show was. It’s made it confusing to snag each unique one for the achievement.
EDIT: Okay this bug is actually completely backwards. The show displayed on the map icon is correct until 5 minutes before the start, at which point it changes to what the next show is intended to be. So for example, “Forget Me Not” was displayed until 7:55 local time for me, and then was replaced with “The Cruelty of Dornic”. However, the show we played was in fact still “Forget Me Not”.