I did a few of them around roughly the dawn of time. That would be 1981 or 1982. I don't remember when time actually dawned, but I must have been there. Just ask my kids.
My main memories of Battles of the Bands:
First one: I was a junior in high school. My best friend was our drummer. We had two adults on guitar and both of them were far above average lead players. Our lead singer, who was in the same class as the drummer and I, quit a week and a half before the show. His replacement had never sung in front of a crowd before. Be totally froze. Not just that he couldn't sing once he realized how many people were watching, he couldn't MOVE either. Statue city. I stepped up and tried to take over lead vocals while we waited for him to get over it. It was not pretty.
Second one: Senior year, same drummer, me, my girlfriend on keys, and one of the guitarists from the previous band. Drummer, Girlfriend, and I all sang. I'd gotten better. This one was at the bar upstairs above a bowling alley that is now a church. We were the fourth of seven bands to play. We were the only ones to get the whole audience up on their feet singing along and worked up. We came in third. Shockingly the winning band included the son of one of the two promoters on drums. Every song he played went 'boom-bap-boom-boom-bap' all the way through.
Third one: band from the second one playing at the same place the first one was at, just a year later. Covers allowed only. We did (as best as I can recall) Hold On Loosely, Tempted, Every Little Thing She Does Is Magic, Stop Dragging My Heart Around, Don'T Stop Believing...and then topped off all that pop music set with...Day Of The Eagle by Robin Trower.
Admittedly not the best set planning. But it was cool watching how all the people who'd been getting into it suddenly weren't, for the most part. But the people who hadn't cared all set suddenly got fired up.
We didn't even place in that one. But some people came up afterwards and asked if we could do a whole night's worth of stuff like the first three quarters of our set. We said "Oh sure. We could do another five hours like that." and they booked us to play for our own prom.