The ghost town map seems appropriate for such event. It's big, has alot of different terrain types, and is mostly unknown. Problem is most containers are in the little bunker on the west, so more should be added for the event, the gear spawns would have to be carefully balanced and well placed all around the map, exit grids removed...
Also, to make it feel like a real hunger game type of thing, nick names should be hidden, only HP visible, to have a real "I don't know this guy" feeling. Players will try to gather up in factions anyway, but this will make it harder, and cause friendly fire.
But all this requires time and work, and all this for some kind of big TC like fight including several factions fighting each other. In the end only one remains and members fight each other 1 v 1. End of story.
Something that would require less work and would still be fun is making the map accessible like in last pre wipe madness, give the magic locker status to one of the lockers in the little bunker. It will last let's say until wipe, it may spawn some tier 4 rarely, and it will be an entertaining map to fight on, refresh pvp a bit until season 3 is ready, without sucking to much dev time.