I know I'm late but Ax, if you're looking into LA shows, the best site is Scenestar. They also post set times.
http://thescenestar.typepad.com
Most US festivals are in summer, but if you want one where you won't be hot, check out Outside Lands in SF. It's freezing.
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Cheers.
Freezing? Sign me up. I have no idea why summer is seen as festival season. Basically the last thing I want to do when it's 35+ and not a cloud in the sky is be directly in the sun among a throng of people on a concrete surface. That's weather for a cold beer in the shade.