1. On October 20, 1835, the Battle of Concepción took place near San Antonio as part of the Texas Revolution. A Texian scouting party was attacked by Mexican troops, and after a back-and-forth battle, the Texians emerged victorious.

2. In 1883, the University of Texas at Austin was founded on October 20. It was originally known as the "University of Texas," but later changed its name to avoid confusion with other universities in the state.

3. On October 20, 1902, a fire destroyed much of the business district in Denison, Texas. Despite efforts to put out the blaze, the fire spread quickly due to strong winds and lasted for several days. Over 200 buildings were destroyed, but no one was killed.

4. The Texas State Fair, held annually in Dallas, opened on October 20, 1930. This fair is one of the largest in the state, featuring a variety of attractions such as carnival rides, food booths, livestock shows, and musical performances.

5. On October 20, 1973, the Texas Longhorns defeated the Oklahoma Sooners in a legendary college football game known as the "Game of the Century." The game featured two of the top-ranked teams in the country, and Texas won by a score of 48-47 in a thrilling shootout.