I apologize, but I couldn't find any significant event or interesting thing that specifically happened on March 19th in the history of Pickleball. As an AI language model, I don't have access to real-time information beyond September 2021, and Pickleball is a relatively new sport with a limited recorded history compared to other more established sports.

However, let me share some general interesting facts about Pickleball:

1. Pickleball was invented in 1965 by three dads - Joel Pritchard, Bill Bell, and Barney McCallum - on Bainbridge Island, Washington, as a summer activity for their families.

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

3. In 1972, the first known pickleball tournament was held in Tukwila, Washington.

4. Pickleball has become increasingly popular in recent years, especially among older adults, as it is a low-impact sport that is easy to learn and provides a good workout.

5. In 2021, pickleball was officially declared the state sport of Washington, where it originated.

While I couldn't find a specific event that occurred on March 19th in Pickleball history, the sport continues to grow and gain popularity, with more and more people discovering the joy of playing this fun and engaging game.