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Hi, a bunch of Walking Dead cast members are coming to my town's comic con this year and I wanted to buy a poster and get them all to sign that. I've never done that before. Will they be able to sign it? or are their rules against things like that?

I've never heard of there being a problem with a poster being signed at a convention so long as it was approved by the celebrity in question. I say, go for it. C2E2, is it?