Tonks: is doing her usual helping where she can thing. She'll probably be doing some kind of patrol to make sure the monsters don't come back, and she'll be checking in with her family and trying to talk to anyone who's having a breakdown.
Snape: is gathering herbs for his potions ingredients, and he'll be crossing the bridge when it collapses. He'll be badly hurt, and someone will need to be there, if possible. Greg? I think we talked about this?
Merlin: is getting sicker and probably needs to be sedated, lest he wanders off. He's still babbling, but he's not panicking - rather, he's probably cornering anyone who will sit and listen to him go on about nothing.
Victoire: dies today. I'm open to how this happens, who might witness it, etc. Not entirely sure what opportunities there will be for dying today, unless there are a few straggling monsters around?