Wow Bongo!This morning i was going to suggest an idea lol xD.
I was thinking Of Fast Build in Survival:
max of player I guess,maybe 10??
We give stuffs like [1 stack of wood] equally among the participants
We also give a theme.
They have to build something in about 10 mins.
The best thing in it that they are in Survival mode+they wont have unlimited items 😀
Its like using their creativity