I used to do hide n seek on an old Trade server *before it went down... Happy that it did*
Mainly hosted events once in a while.
Got people to pay attention and listen, said hey; if you want to try this, and possibly win items, anyone who wants to donate any item towards a pot; that will then go to who ever wins, then gets said items.
Worked most of the time, sometimes people wouldn't listen or people would join and be confused, but it did work out non the less.
Only real issues were sometimes getting players, getting items that people could win, and having to repeat rules every few minutes.