Age of empire style peasant battle with blue tunic vs red tunic and some cheap axes like the peasants used to cut trees haha
+1 to this, could do Stone Age battles (naked with spiked clubs, goedendags, studded warclubs and sticks, or stone throwers with ragged outfit)
Could do opposing siege camps with siege shields and catapults and healing tents and siege towers.
Could have an assassin style game with deathmatch... some people RP as guards, someone is the VIP and a few are assassins.