ok so there's a park in the harford county area that's fairly easy to get to from 95. It's called Hickory Park. I just called to check it out and they do not allow reservations, so there is no fee for use, it is strictly first come first serve. Its a 20acre plot with sport fields and plenty of parking in addition to a single pavilon with 10 or so table and a grille or two. It also has bathrooms, but not sure if they're unlocked or anything.
Here's the catch, talking to the lady on the phone she claims they are not allowed to rent it out due to how often it is used for Rec-sport use, but it is a public park so they can't really stop anyone from using it and since it does not have a rental/reservation policy it is first come first serve. I live in the area, so I could easily secure it early in the morning,plus we're friendly enough Im sure we could share what portions we dont use.
I drove past it this weekend and it was empty on sunday around 1215pm. This is my suggestion and I think Jensen and I are itching to host a meet.
Here more info for it:
Harford County, Maryland - Hickory Park
from:39.479268,-76.263914 to:Creswell Rd/MD-543 to:2310 Ady Rd, Forest Hill, MD 21050 (Hickory Park) - Google Maps
one warning though, within a mile or so of the park is a county building which gets a lot of cop traffic and the speed limit approaching the park is 35/45 I think, so no tom foolery on approach and such. There are a lot of fun roads around the park too.