This schedule includes many tracks in the eastern USA (but a fair number of folks come to these races from all over the USA, so I think it's fair to include this list as a "National" event)
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Vintage Racer Group (VRG)

Schedule-2009

http://www.vrgonline.org/

February 21st
Winter Warm-up (indoor karts)
Mount Kisco, NY

April 10—12
VDCA Wild Hare Run
Virginia International Raceway
Virginia

May 1-3
Jefferson 500
Summit Point, WV

May 15-17
Vintage Celebration
New Hampshire Motor
Speedway

June 20-21
VARAC Mosport Vintage Festival
Mosport, Canada

July 11-12
PVGP Historic Races
BeaveRun, PA

September 18-20
Thunderbolt Historics
Lightning Track
New Jersey Motorsports Park,

October 16-18
VRG at the Glen
Watkins Glen, NY

November 27-29
Turkey Bowl
Summit Point, WV