Burtonsville, MD every Sunday Morning from about 8-11am at the intersection of rt 198 and US 29. Take Exit 33B off I-95 and go west to US 29. It's in the shopping center in the southeast corner of the intersection. Usually at least 70 or more cars there. It is a free unorganized event which is nicknamed "church of the holy donut". It used to take place across the road near the donut shop before that area was renovated.
If you're comming from the Rockville area, you could take Rt 28 East to Route 198 East until you get to US29
[This message has been edited by jazz4cash (edited 07-03-2011).]