while riding thru queens yesterday i came across a ballfield with a few of the same style of vendors i'd seen down in red hook on saturdays. i've seen them before, it seems to be a regular thing.
i was there at 2 and they were packing up -- you might try going earlier if you're interested.
i didn't eat anything -- greasy fried food right at the beginning of a bike ride is not a helpful thing.
it's in a park in kind of a weirdy fringe area almost under the bqe. from jackson heights take 69th street below st michael's cemetary north to the end. from astoria take the bqe west service road past the bulova office and turn onto 69th street. unfortunately i couldn't figure out the park name from any map i have.