I apologize for the confusion, but I could not find any significant events or interesting things that specifically happened on June 12th in the history of pickleball. Pickleball is a relatively new sport that has gained popularity in recent years, but its history is not as extensively documented as other sports with longer histories.

However, I can share some general interesting facts about pickleball:

1. Pickleball was invented in 1965 by Joel Pritchard, Bill Bell, and Barney McCallum on Bainbridge Island, Washington, USA.

2. The sport is named after the Pritchards' family dog, Pickles, who would chase after the ball and run off with it during the early days of the game's development.

3. Pickleball is a combination of elements from tennis, badminton, and table tennis, played on a badminton-sized court with a perforated plastic ball and solid paddles.

4. The first official pickleball tournament was held in 1976 at South Center Athletic Club in Tukwila, Washington.

5. In 2021, pickleball was officially declared the state sport of Washington, honoring its origins on Bainbridge Island.

While I couldn't find a specific event for June 12th, these facts highlight some of the interesting aspects of pickleball's history and development. As the sport continues to grow in popularity, it's likely that more significant dates will be added to its historical record.