Can I bring an old book to a meet and greet with the author to sign instead of the book that is being promoted?

So I’ve never been to a meet and greet with an author, but in December Christopher Paolini will be coming to my country and I’d love to go see him. He’ll be here for a promotional tour of his latest novel Murtagh, however I would love to have my old copy of Eragon (another one of his books) signed. That is of course if he does decide to sign books at the meetings 🙂

I was wondering, would that be allowed? Would it be ok? I did buy the new book, but I just have a way stronger connection with Eragon and would love to get an autograph there lol

by TheFfrog