I've seen threads here about Van Halen at The Us Festival but can't say I've seen much about what might have been their first headlining gig at a festival. I know they played a few festivals before this one but I'm pretty sure this was the first one they headlined. The second (also the last) day of The California World Music Festival at the LA Coliseum. The first day (saturday) featured Cheap Trick and Aerosmith. Nugent played sunday during the day and Van Halen played sunday night. I've not seen any videos of the concert but going on memory alone Van Halen seemed all about the music then. Not much flash just straight up rock and roll. I'm sure somebody out there can post some video.