This is almost all Model A parts. All the goodies come out for the national meets. Seems like 40-50 sellers (could be wrong with my guess)? Not sure what to expect this year, but always good stuff at these meets.
do they sell between vendors before open to the public?
No. Some meets have a day to set up and that's when the vendors can sell to each other. Usually MARC swap meets begin when vendors arrive. As each vendor sets up the meandering crowds seem to gather around. I didn't see a schedule on the convention site but vendors usually start setting up on Sunday.
This meet will have the option of indoor or outdoor swap spaces. There can be a significant temperature difference between the two. I was thankful that I had an indoor space last time.
I thought the last I heard was the EAA area was not available now, like it was back in 2012. Is that still true and if so where is it going to be now - the La Quinta hotel?