I've actually been wondering about that, since I've heard differing stories about how different cons treat guests. I'm sure they'll want him to host a panel or two, as well as probably hold an autograph signing, but beyond that, what will AWA* really need him for? I know there are some cons where guests are allowed to just be con attendees when they're not on the con clock - is AWA like that?
*Obviously ZUN is going to want some time to himself as well - this is strictly about what AWA will be expecting of him.