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Your badge will definitely get you (+1) into Cookoff as well as the Carnival, HOWEVER the only tent you can get into with your badge is the Chuckwagon Tent, which offers a free bbq plate to attendees.
If you’re looking to get into a cook off team’s tent, then you’ll need tent-specific wristbands. Best bet is to reach out to your network of friends and coworkers. One of them can help you get connected with a tent OR they know someone who can. Very few tents, if any, will take payment on the spot for access to the tent so plan ahead before going out there.