How many items are acceptable for the book signing? Only one per person? I don’t want anything crazy, but would it be okay to get 3 autographs to cover a trilogy?

I'm thinking it has to be one per person. It's a 1 hour event with 75 tickets. That alone works out to less than 1 min per person. Add to it that you can show up without a ticket and possibly still get something signed makes things very tight on time. 

I picked up "another ticket for me" for a friend as well as tickets to another book signing just in case it's a limit of one per person.

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