1. In 1883, the state of South Dakota was officially organized under the provisions of the Dakota Territory, enabling act. This made South Dakota the 40th state of the Union.

2. In 1929, the town of Murdo was incorporated, located in Jones County, South Dakota. Murdo is known for being the "Gateway to the West" and is home to several unique attractions, such as the Pioneer Auto Museum and the famous 1880 Town.

3. The historic Black Hills Playhouse, located in Custer State Park, opened its doors on June 15, 1946. The playhouse is a popular summer destination for theater enthusiasts and has hosted performances by many famous actors, including Kevin Kline and Jessica Tandy.

4. On June 15, 1970, the Aberdeen Community Concert Association presented a performance by the New York City Opera National Company at Aberdeen Central High School. This event was a significant cultural moment for the city and showcased South Dakota's vibrant arts scene.

5. In 2013, the world's largest biker bar, the Full Throttle Saloon, was destroyed in a fire on June 15. The bar, located in Sturgis, South Dakota, was a popular gathering spot during the annual Sturgis Motorcycle Rally, attracting thousands of visitors each year. Despite the devastating loss, the Full Throttle Saloon was eventually rebuilt and remains a prominent landmark in Sturgis.