i was thinking about this, but in a slightly different way.
the president has gone to a philharmonic, and many rich guests are attending. however, a terrorist group hates the president, and sends an assasin to kill him.
there are 4 teams:
assasin: army of one. only has a combat knife and a lockpick in the beginning, but can find silenced weapons, a butterfly knife, or even some C4 throughout the building.
guests: disguise the assasin, and roleplay as guests while watching the show.
secret service: the president's body guards. armed with combat knives and SMGs.
President: sits in the presidential booth, may not go anywhere without an escort. you have to be host to be president, so the president will reset the game when either the assasin dies or he dies.
suggested add-ons:
C4
T+T weapons
musical sounds
butterfly
lockpick
key