I would go take a look at guitar center and listen to some speakers. You aren't going to get great clarity, but you will get some serious SPL.
Another option is DIY. If you are somewhat handy you could buy some speaker kits from diysoundgroup and get a lot of bang for your buck. But then you also need amplification and subs. I think PA speakers are the simplest option in terms of transporting and setting up.
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