Depends when your show starts. Be mindful of everyone elses schedule. And how it may effect u. I would say earlier the better
It depends, some shows that aren't as popular as others you can show up maybe two - three hours before doors open, but for other popular shows some people try to camp out the day before to get first row or maybe even a couple days. It just depends on the show :)
I'm assuming you're talking about a concert pit, if not I apologize. It depends on the show as I haven't been to any shows at Comerica that was General Admission. What I do know is that doors open one hour prior to the show so that is the minimum time I would shoot for.
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