I have an idea.
The name: FIND!
Object: You have 4+ Players participating in each game, You assign them to find certain objects [ Example : Find an NPC with a Party hat ] You have people who aren't playing at the spots people need to find ( Too make sure they don't cheat ) Once the participants find all the places they need to find, they need to make it back to the finish line, The first one back wins. Once the first person is here you ask the people that were at the places if they had been there, If all is sweet they win a prize.