Hosts and guests keep disagreeing about cookout rules that neither side ever said out loud, and the grill almost never has anything to do with it. The rule hosts name most oftenA guest list feels settled the moment it goes out, right until the doorbell rings one extra time. More than two-thirds name no uninvited guests as their top unwritten rule, and that answer holds steady regardless of age or background. Guests with a food allergy often say nothing at all, picking around a dish instead of asking what went into it. A group text a few days out settles more cookout arguments than any etiquette rule has.