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I'm not a babysitter if grown adults can't figure out their limits that's sad for them. I've been to plenty events where the only food during cocktail hour was a candy buffet. Nobody got sick, because nobody was dumb enough to get schnockered on an empty stomach. We aren't doing a full bar either, so I have no doubt that the popcorn will be plenty. Many bars and breweries serve popcorn as a filler to avoid drunkenness when they don't serve food.
But @Jen4948, OP knows every single thing there is to know about every single one of her guests.