You may try to make Gado Gado.
The tofu is sliced and fried and leave it cool off.
Make yourself some nice peanut sauce (slice and hack an onion, heat up some oil, fry the onion glazy, put peanut butter in there, little bit of cooked water just to get it more creamy, bit of brown sugar, bit of lemon juice and sambal as much as you like, or use spanish peppers or cayenapepper and ginger), boil eggs (hard but not green/ blue) boil ketan rice, nice sticky and cut cubes.
Get some pepinos or cumcumbers. Slice them, and leave them in some lemon juice and a bit of sambal.
Get some common green beans, boil it and leave it to cool off.
Take some Mung bean sprouts, mix it with the coled of green beans and make it nice presentable with the slices pepino or cumcumber,the slices hard boiled eggs and the slices of Tofu.
Additionally you could make some satèh, chicken satèh is prefreble given the type of meat. Marinate it in a Manis soja sauce together with five-spice powder (chinese) with crushed garlic and leave it for a few hours in the fridge to pick up the taste, and roast it preferably over charcoal.
The finishing touch = Krupuk or Kerupuk. I believe the aussies call it prawn cracker. You can buy it at any chinese toko but I would encourage you to try the fry it yourself ones. There are dozens of sorts and any color size and shape.
All in all it's fairly easy to make and tastes very good and if you leave till the next day, it will taste even better.....
Have a nice party!
Cheers
Borgia