Somebody posted this to the Porsche list. Check with the specific clubs to confirm dates.

2001 DFW - Texas Autocross and Road Race Events
<UL TYPE=SQUARE>
<LI>January 13-14 Texas World Speedway Motorsports Club Drivers school
<LI>January 20-21 SCCA Racing School and SCCA Regional (TWS 1.8)
<LI>February 10-11 Texas Triathlon TMS & Texas Motorplex (RR, AutoX, Drag)
<LI>February 10-11 John Eagle Honda Performance Drivers School Texas World Speedway
<LI>February 11 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Texas Motor Speedway, parking lot
<LI>February 18 Mavrick Region, Porsche Club Standridge Stadium, Carollton/Dallas
<LI>February 24, 25 Driver's Edge Texas World Speedway
<LI>March 10-11 SCCA Double Regional Race (TWS)
<LI>March 11 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Mineral Wells Airpark, Mineral Wells
<LI>March 24, 25 Driver's Edge Texas Motor Speedway **Tentative
<LI>March 31-Apr 1 Maverick Region PCA AX School @ Mineral Wells
<LI>April 4-7 C.A.R.S. BIG BEND OPEN ROAD RACE - Open road race on Texas Highways!
<LI>April 8 SCCA Regional Race (TWS)
<LI>April 14-15 NASA TX @ TWS
<LI>April 21, 22 Driver's Edge Texas World Speedway
<LI>April 29 Mavrick Region, Porsche Club Mineral Wells Airpark, Mineral Wells
<LI>May 5-6 NASA TX @ TMS
<LI>May 5-6 SCCA Double Regional Race (Abilene)
<LI>May 6 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Mineral Wells Airpark, Mineral Wells
<LI>May 12-13 Texas World Speedway Motorsports Club Drivers school.
<LI>May 26, 27 Driver's Edge Texas Motor Speedway **Tentative
<LI>May 26-27 SCCA Double Regional Race (TWS)
<LI>June 3 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Pennington Field, Bedford
<LI>June 16-17 SCCA Double Regional Race (TWS)
<LI>June 29 Mavrick Region, Porsche Club Standridge Stadium, Carollton/Dallas
<LI>June 30-July 1 NASA TX @ TWS
<LI>July 8 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Pennington Field, Bedford
<LI>July 7-8 Texas World Speedway Motorsports Club Drivers school.
<LI>July 22 Mavrick Region, Porsche Club Mineral Wells Airpark, Mineral Wells
<LI>July 28-29 NASA TX @ TWS
<LI>August 4-5 Texas World Speedway Motorsports Club
<LI>August 5 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Pennington Field, Bedford
<LI>August 25-26 NASA TX @ TWS
<LI>August 26 Mavrick Region, Porsche Club Mineral Wells Airpark, Mineral Wells
<LI>September 1-2 Texas World Speedway Motorsport Club
<LI>September 2 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Pennington Field, Bedford
<LI>September 8, 9 Driver's Edge Texas Motor Speedway **Tentative
<LI>September 15-16 SCCA Double Regional Race (TWS)
<LI>September 16 Mavrick Region, Porsche Club Standridge Stadium, Carollton/Dallas
<LI>September 22-23 John Eagle Honda Performance Drivers School (TWS)
<LI>October 6-7 NASA TX @ TWS
<LI>October 13,14 Driver's Edge Texas World Speedway
<LI>October 14 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Pennington Field, Bedford
<LI>October 27 Mavrick Region, Porsche Club Standridge Stadium, Carollton/Dallas
<LI>October 27-28 NASA TX @ TMS
<LI>November 10,11 Driver's Edge Motorsport Ranch
<LI>November 11 Equipe Rapide Sports Car Club, Dallas/Ft. Worth Mineral Wells Airpark, Mineral Wells
<LI>November 17-18 SCCA Regional Race (TWS)
<LI>November 24-25 Texas World Speedway Motorsports Club
<LI>November ??-?? NASA TX @ ??
<LI>December 1,2 Driver's Edge Texas Motor Speedway **Tentative
<LI>December 15-16 NASA TX @ TWS[/list]

Funny, you listed the regional SCCA road races but not the Nationals.
The first one is Feb 16-18 at TWS double national. There are usually a lot of cars there from all over the country.
Still thats a lot of racing.