with T-town behind us and the summer coming up, I will take this opportunity to plug (yet again) the Brooklyn Bike Jumble on May 31st in Park Slope, Brooklyn.
More details here: http://www.nybikejumble.com/
As for parking, as some people may have issues with this, There is no designated parking area.
There will be an unloading/loading area within the park, so getting stuff to the Jumble shouldn't be difficult. However, parking your car/van will have to be on the street. I have received assurances that this won't be difficult.
In case the street does not offer parking options I do know of an unofficial place to park your car that is in the area. Please contact me for more information at this email address.
Long Island City, NY