Tom did not state outright as such, but I don't think that exchanging of the ticket from one day to another was considered acceptable. That said, because there was no such caveat given, I don't see how we could keep you from doing this. I'll leave it up to your own decision.
Next year we will have stricter (and stated) rules regarding this behavior.
Also, keep in mind that these tickets were only made available to NSXCA members so any transfer will have to be to NSXCA members in good standing. If Batman is not yet a member, he can sign up at the event.
J