Ideas for competitions for Stronghold 2:
Castle Design: Designing the most efficent and impressive castle
Seige: A castle built by a Dev, then games hosted on the web (dev as the beseiged and player as the seiger, dev can't do anything but watch and time) whoever has the best time wins.
1 vs 1: Simple 1 vs 1, no restrictions, whoever wins goes forward kinda like a tournament.
2 vs 2: simple 2 vs 2, no restrictions, winning team goes forward
2 vs 2 Close Quarters: Each teammate starts very close to the other, and have to work together to build a functioning castle. Same rules as for the normal 2 vs 2.
Field Battle(single or teams): Each player/team is given a set amount of troops to be divided amongst the team beforehand. Then each team fights each other in a field map (no castles or estates, just men) and whoever kills the opposing lord first wins.
They're my base idea's, i'll think up some more later