On this day in Celtics history, we celebrate Ray Allen's birthday, a legendary shooter born in California. Allen's collegiate success at UConn led him to be drafted fifth overall in 1996, eventually joining the Milwaukee Bucks and later the Boston Celtics. His pivotal role in forming the 'Big Three' with Kevin Garnett and Paul Pierce culminated in a championship in 2008, although his move to the Miami Heat sparked controversy among fans.

Additionally, this date marks the signings of Daniel Theis and Guerschon Yabusele in 2017, both of whom contributed to the Celtics' roster during their tenures. Theis became a reliable contributor, while Yabusele's journey has taken him overseas. The Celtics also made trades involving notable names like E'Twaun Moore, and mourned the loss of former owner Jack Waldron.