Take a cosmic bowling alley / laser tag arena. Kick everyone out at 11. Insert DJ gear and a dozen or so DJ’s. Turn down the lights. Turn up the bass. Let in the girls in Bikini’s and go go dancing gear so they can do all the UV body painting.
Have the Umbrella Corp Security forces secure the perimeter. Open the doors at the turn of midnight and let all hell break loose until the sun comes up and we see who is left standing.