1. In 1886, the first Wyoming State Fair was held on May 4 in Cheyenne. The fair was organized to promote agriculture, mining, and commercial industries in the state. Today, the Wyoming State Fair is held every August in Douglas.

2. On May 4, 1896, the University of Wyoming was established by an act of the Wyoming Territorial Legislature. The university has since become a major educational, research, and cultural center for the state, offering over 190 undergraduate, graduate, and doctoral degree programs.

3. In 1927, May 4 marked the opening of the first hotel in Yellowstone National Park. The Old Faithful Inn, which is still in operation today, was built by the Yellowstone Park Company and remains the largest log hotel in the world.

4. On May 4, 1943, the Casper Troopers, a drum and bugle corps from Casper, Wyoming, was founded. The group has won numerous championships over the years and has performed at events such as the Macy's Thanksgiving Day Parade and the Rose Bowl Parade.

5. In 1987, May 4 became a significant day in Wyoming as the state legislature passed a landmark anti-discrimination bill aimed at protecting the rights of LGBT individuals. The bill was the first of its kind in the United States and was considered a major victory for the LGBT rights movement.