Plan idea:
Hans, Wesley, Max, and potentially Mortus go left to rescue the girl. Their next objective could be to simultaneously burn the watch tower, or stealthy take out the guards (Hans can climb/Motus could cast sleep). The fire of the watch tower would stop the play, or Julian setting off a flashbomb or a gunshot.
Julian and Ragni stay in the middle along the way in and could set off the loud noise if Mortus doesnt flame the tower. Presumably, commoners just watching the play will flee for the stairs. Ragni and Julian would be able to fend off the armed baddies that remained, and work their way to the stage. Perhaps they would encounter the leader of the cult.
Hans and Admund are on the right, can support Ragni and Julian with ranged fire. They would circle around the right. Presumably, if the ambassador or other culty baddies from Cathay are here, they'll maybe work their way north toward the ship? Admund and Hans would cut them off and we could push in to the stage from the back stage side. If things started going poorly for Julian and Ragni, Hans could deliver arrows, or both could move in to assist.
All would eventually meet in the middle at the stage.