Someone told me some vendors are still open while the rest of the market is closed, is this true?

It's the better months... Sept-nov.. unless there's an eagle's game @1pm most are out til 4pm packing up.

No

There are very few that do. Its best to call ahead. Maybe get the numbers to the vendors to find out directly.

There are very few vendors this year on weekends.you can call them to see.