I apologize for the confusion, but I couldn't find any significant events or interesting things that happened on March 20th in Pickleball History. Pickleball is a relatively new sport that was invented in 1965, and its history is still being written. While the sport has gained popularity in recent years, there are not many well-documented historical events tied to specific dates, especially for a particular day like March 20th.

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

1. Pickleball was invented on Bainbridge Island, Washington, by three fathers - Joel Pritchard, Bill Bell, and Barney McCallum, as a summer pastime for their families.

2. The name "Pickleball" has two possible origins: either derived from the Pritchards' family dog, Pickles, who would chase after the ball, or from the term "pickle boat," referring to the last boat to return with its catch in crew races.

3. The first permanent Pickleball court was constructed in the backyard of Joel Pritchard's friend and neighbor, Bob O'Brian, in 1967.

4. In 1972, a corporation was formed to protect the creation of the game, and the first official rulebook was published in 1974.

5. The USA Pickleball Association (USAPA) was founded in 1984 to promote the growth and development of Pickleball on a national level.

While I couldn't provide a specific event for today's date, I hope these general facts about the history of Pickleball were still interesting and informative.