1. On October 20, 1880, Tombstone Sheriff Johnny Behan and his posse successfully captured two notorious outlaws, Billy Claiborne and Frank McLaury, near Alma, New Mexico. The two men were wanted for numerous crimes including robbery and murder.

2. October 20, 1932 saw the opening of Carlsbad Caverns National Park in southeastern New Mexico. The caverns, carved out of limestone over millions of years, are home to an array of unique rock formations and underground ecosystems.

3. October 20, 1957 marked the dedication of the New Mexico Museum of History, Science, and Art in Santa Fe. The museum is home to over 35,000 artifacts and exhibits covering the history and culture of New Mexico.

4. Notable New Mexico artist Georgia O'Keeffe passed away on October 20, 1986 at her home in Abiquiu. O'Keeffe was known for her unique and vibrant depictions of the American Southwest landscape.

5. On October 20, 2008, the New Mexico Spaceport Authority signed a lease agreement with Virgin Galactic to construct the world's first commercial spaceport in southern New Mexico. The spaceport, located near Truth or Consequences, is designed to serve as a hub for space tourism and research flights.