I was wondering about the usual availability of electricity at outdoor events. I am sure it varies between an electrified Pagoda, to a back yard with none. I could run a 100ft cord from an outside outlet, and have a battery generator I have not tried yet. A battery powered speaker would probably be best, but more money and and an iffy return.
Bernie
Bernie, I am happy with my Bose S1 Pro battery powered speakers, and my Flahfish portable power station that keeps my keyboard, mixer, vocal effects unit powered up.