well how many ppl u expecting since a its "huge" party
but u can fit half the server in a bunker :D and that gives it a personal though. and just rent the things u like placed outside at the Event NPC.
aaaand if u want to do something really special u can always ask "PEX" for help hes the event person of SOE but u do need to have a idea of what u want and contact lllooonnng in advance.
and if u need entertainers just ask Eved or any Moonling u know for help.