It really depends on your state’s bar laws. Check the place’s website for info about their age policy (some places are 18+ always but you can’t buy alcohol, some are 21+ always even to enter, some become 21+ after a certain hour like 10pm or something, it really depends on local law)

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Some of them will let you in if you’re 18 but will mark you so you’re not served alcohol. You can always call and ask! But no, that aside, it wouldn’t be weird to go by yourself.

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They don’t because they serve alcohol

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