Yes you can
The box office only sells tickets for shows the day of, so chances are tickets will be sold out. Unless they release some last minute, which happens rarely.
Yes, if ahead of the time/day of the event
Yes, but you may end up in the way back.
Yes you can, but you can't gsrauntee it won't be sold out.
You may want to call The House of Blues and ask if that can be arranged.
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