I'm going to a couple in August. One of them is the Denver Burger Battle and the other is Chicken Fight Fest. Various small independent restaurants participate and we vote on who has the best food. Tickets are all inclusive. Everything is free inside the event. It might be a little expensive for those who don't consume alcohol. They don't offer a non-drinking option.
https://denverburgerbattle.com/
https://chickenfightfest.com/