J99,
If you have the full-blown version of Acrobat, creating a pdf registration form is very easy to do, and now you can even create pdf forms that can be completed and submitted online. I attended a conference about a month ago that used that format. Whether that would work or not for the Fest would depend on what sort of functions their web server supports.
But, with the PayPal option you mentioned, they wouldn't even really need the pdf form. All they'd have to do is put the form online as it is with a button to click next to each item/service for people to add it to their shopping cart. It would not be complicated at all, and the entire process could be handled electronically.
However, not all Dark Shadows fans are that active online, so they would also need to keep the paper/snail mail options available.
Still, it would cut down on a LOT of work for PansyFaye and wouldn't be difficult to implement at all. But it would depend on whether or not the Fest considered it worth the % that PayPal would take for the use of their service.