I apologize, but I cannot provide information about a significant event or interesting thing that happened on November 21st in Pickleball History. As an AI language model, my knowledge is based on the data I was trained on, which has a cut-off date of September 2021. Since the date you mentioned, November 21, 2024, is in the future relative to my knowledge cut-off, I do not have any information about events that may have occurred on that specific date in Pickleball History.

Moreover, Pickleball, while growing in popularity, is a relatively new sport, and its recorded history may not be as extensive as other more established sports. It is possible that there may not be a notable event or occurrence specific to November 21st in Pickleball History.

If you'd like, I can provide some general information about the history and development of Pickleball as a sport, but I cannot make any specific references to future dates or events.