Originally Posted by DaedalusAlpha
You chould have some sort of obstacle course maybe?
I have seen cool videos with battle arenas like the TOGasseum. They used bridges, archery, water, lava all as part of the one environment. Structures were being destroyed whilst players were on them. There are many other options, like sand positioned to easily collapse, slow sand from the Nether, wood on fire....
But first we need to get some practise at some basic scenarios. An open field first then and a field with a couple of small walls to hide behind. And sword or fist only, no archery or armour. Perhaps everyone starts with nothing but have various chests around the field with the selected weapon in them. So you have to race to get a weapon as well. Perhaps for future challenges the organisers can put arrows in chests so combatants can restock during the battle.
Ultimately, the scenario is up to whoever is organising the challenge. All they need to do is make sure that at the end, everything is returned to its original state.