Stagehanding

If you live in a city of somewhat reasonable size, there will consistently be concerts, political rallies, plays, corporate events, etc, that need a stage. Thus, there is a large industry dedicated to unloading trucks, moving things from here to there, building the stage, assembling set pieces, running AV, lighting, and pyro, taking care of anything and everything before, during, and after a show, and then packing everything up again. And this industry constantly needs fresh faces to show up to push this thing over here and tighten this thing with this wrench.

The upside is that it requires no work experience at all, is constantly hiring, has potential to teach you other more marketable skills like getting a forklift cert, and you can choose your shifts - working for multiple different companies at once and picking the shifts you want to work for who and when. Also, your coworkers tend to be cool, or at least characters - the whole industry has a sort of island of misfit toys feel. Your lunch table might include a college student working their summer job, a retiree making some extra income, an aging punk, a gruff blue collar guy, and an ex-felon, all shooting the shit about whatever is going on that day. And speaking of lunch - you typically get fed when you have a day that goes over 5 hours, and concert catering is gooooood.

The downside - lots of the guys who tour with the band, who are going to be the ones in charge of you for the day, can be real assholes. The rock'n'roll schedule will take its toll on your sleep cycle - lots of shifts will start at 10:30PM and end at 3AM. The work actively discourages thinking or creativity, as your tour guy already has everything figured out for exactly how he wants it, and will shout at you if you take the initiative to do it your own way. And if you are shy and have trouble advocating for yourself, you could just be stuck pushing boxes for years.