PFM accepts online vendor interest forms throughout the season. If invited to apply, new vendor applications are sent out at the beginning of the year, usually in the first two weeks of January. To find out how you can apply to become a vendor, visit the Become a Vendor section of their website.
That's a very good question! I expect that if you inquire in the right place, you will be able to obtain a booth. I imagine though that you may find there's a long waiting list. Good luck to you!
Thanks! Your answer is awaiting moderation.