If not already sold out you can buy tickets at the door. If it's a big name show I would recommend purchasing in advance.
Can you purchase tickets at the venue for events that are a few weeks away?
If tickets were reserved in advance, folks have until a half hour before showtime to pick them up. If they fail to pick them up, then they are released for sale at the door, no exceptions! So, the bigger the name, the more likely the show will sell out.
Yes
Yes, assuming the show is not sold out already.
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