i have an idea
build a 4x4 (or 5x5 or sth) area of zones of size 6x6 or so, build a pyramid on each with level ground and a 2 wide path between them and put a white flag on top. everyone gets knockback 2 swords (no other enchants) and starts wherever they choose. set a time limit of say, 10 minutes, and it's a free for all to change as many flags to your color as possible
alternatively maybe have 2 minute rounds or something where the first round is a ffa get as many flags as you can, then the succeeding rounds are 1v1 challenges between zones