Probably specific to the show, so check for restrictions specific to the show. There is alcohol served, and a couple of the guests definately multiple drinks for the show we attended, but nothing too crazy that night. No seating for most shows at this venue, so everyone needs to be good standing for the duration, and shorter people may have difficulty seeing if not up front.
Maybe teenagers and up, depending on the venue.
There were a few older kids at the last concert I went to. Don't think it is suitable for younger children, toddlers or babies.
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