How about this as an event,
Base Defence.
Takes place in an abandoned bunker, the people are organised into two teams, the defenders and the attackers.
The defenders will get 5-20 minutes to set up and will be given a special class choice at the outfitters to be an engineer (Pancor, Mines, Metal Mk1, detonator, plastiques, shells)
the attackers get to simply satnd around waiting until the time runs out in a "cage", any shots fired at setup will result in a 72hour tempban.
In the "cage" the attackers will have several outfitters spread out, as will the defenders inside the bunker, the classes chosen are from the wonderful FFA events Izual has thought up.
the attackers have to reach the outfitters of the defenders and do away with them, the defender's outfitters will have about 400-500 HP each, be stuck in one hex, and will not use weaponry.
No rewards will be given at the end of the event.
Disassembling during the event will be punished with a 48 Hour tempban
Spawncamping will result in a permaban