This is a few events that I can suggest. Some may be ordinary but others were thought by me.
•Race
•Hide n Seek
•Kill the berserker → The berserker starts off with 250hp
•Treasure hunt
•Catching
•Climbing race
•Number of slashes per minute
•Show Off your skills
•Last Man Standing
•Kill The GameMasters
•Explosive
•Hunt The GameMaster(s)
•Clothing Contest
•Video Making Contest
•Signature of the Week Contest
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GameMaster(s) will be the judge