STEPHENVILLE, Texas -- Preparations for the 2002-03 basketball season will get underway officially Monday night when Tarleton State hosts the ninth annual Midnight Madness festivities at Wisdom Gym.   Doors will open at 11:30 p.m. for the hour-long event that will include plenty of giveaways, several contests for fans and player introductions for both the Texan and TexAnn basketball squads. Both teams will conduct brief 15-minute practices, and the Tarleton cheerleaders and Texan Stars will perform.   The first 200 fans in attendance will receive free T-shirts, while the next 100 people through the doors will get a set of purple or white basketball beads and the next 100 will take home a set of newly designed Tarleton banger noisemakers.   Tarleton students also can participate in a halfcourt shootout for free tuition and fees for the Spring 2003 semester. One male and one female student will be selected, with each getting a shot at the grand prize.   There also will be other contests and prizes that are available to the general public.   Midnight Madness will be broadcast live on KCUB 98.3 FM, with Sports Doctor Ron Newsome calling the action. An online version of the broadcast can be accessed at TarletonSports.com.   Tarleton's men open the 2002-03 season in just three weeks as the defending Lone Star Conference South Division champion Texans visit NCAA Division I powerhouse Texas. Tarleton will challenge the Longhorns Monday, Nov. 4, in a season-opening exhibition contest at the Frank Erwin Center in Austin.   The men's team has back six lettermen and three starters from last year's 25-8 team, and the Texans will be led by senior forward Danny Jones, who averaged 15.1 points and 12.6 rebounds per game last season to earn consensus All-America acclaim.   Veteran head coach Lonn Reisman has added six junior college transfers and a pair of high school standouts.   Tarleton's women, who open the season Nov. 6 with an exhibition against the All-Army team, will return four letterwinners and just one starter. Fourth-yearhead coach Claude Cummings has added nine transfers and five true freshmen.   After Monday's Midnight Madness festivities, both teams will begin their daily practice routine on Tuesday.