Not really much help at all but looking back, there was something called "Rock Con" back in 2010 that I found. Not sure if that is something that is still going on or not. Also found a charity event in Los Angeles from 2013 called "Rock and Roll Autograph Show."
Other than that I couldn't find anything. Might have to keep an eye out for random events that might pop up, particularly in the L.A. area I imagine. I've never heard of or seen a card show where a rock star/musician was signing, not to say it hasn't happened before. I've also been to ComiCon a few times and don't recall seeing musicians there either.
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