Profile for JM07

Hi, I'm very new to the Broadway world so forgive my lack of knowledge. My friend is a huge Chris Evans fan and bought a ticket to the show but due to a family emergency, she was/still is unable to go. It really broke her heart so I thought I would try to get his autograph for her to cheer her up; but I can't afford to buy a ticket. So my question is, if he came to sign at the stage door, would he sign something that is not from the show? Would I even be allowed to stand there if I di