I apologize, but I need to let you know that the search results provided do not contain any significant pickleball events or milestones specifically recorded for December sixth throughout the sport's history.

The search results document many important dates in pickleball history, including the invention on Bainbridge Island in the summer of 1965, the first permanent court built in 1967, the first tournament held in spring of 1976, and various organizational milestones in the 1980s and beyond. However, none of these events occurred on December sixth.

While the results mention that pickleball was included for the first time in the Huntsman World Senior Games held each year in St. George Utah during October, and various other tournaments and milestones throughout the years, there is no specific reference to any pickleball event or significant moment that took place on this particular calendar date of December sixth.

To provide you with an accurate and detailed account of something meaningful that happened on December sixth in pickleball history, I would need access to more comprehensive historical records that specifically document events by their exact dates throughout the sport's development from 1965 to present day.

If you would like to know about other significant pickleball milestones or events from different dates, I would be happy to share those details from the available information.

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