If you have a choice it suggests that you could go to either.
That means that potentially you can be free on the Saturday or the Sunday - otherwise there would be no dilemma.
If you are potentially free on Saturday and potentially free on Sunday I can't see where the problem is - just go to both.
According to google the Sunday trip takes 1hr 57mins to get to. Including the gig that's c7 hours out of your trip. I can't see that you have a real problem.
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sj