As said by the wise Derek Bailey:My guess is that it wil be a giant freeroam that's a combination of all the frat houses and the HOT house. They will work together because at the fight tournament/concert they found out they got a common enemy (I can't say if they already know it's Magnar at that point in time). It will end in a giant fire that will engulf at least one of the houses, thanks to the betas fucking with the fireworks.
"It's just a small house fire. No one's ever died from that".