Paragon Park is a pretty basic proposition - great network of trails, but just a trailer for entrance fees and waiver forms, mobile EMS coverage, and a food trailer for snacks. The city of Hazleton is nearby though, and most "last-minute" items could be found there.
As far as vendors or a formal swap meet - no, we hadn't planned on anything, but if you have something of interest for any attendees, feel free to post it on this forum - there may be others who feel the same way and have stuff they want to trade.