Dolan's company owns Radio City Music Hall, which hosted the event.
ESPN's Rachel Nichols provided more details behind the location choice:
Rachel Nichols @Rachel__Nichols
Really moving to attend this, and @McTen does a great job capturing it. The memorial was held at Radio City Music Hall because as Adam Silver noted, David Stern loved the big stage. Also great: Knicks owner James Dolan, who also owns Radio City, covered all the service’s expenses https://t.co/RnLBU63ze9
Stern served as NBA commissioner from 1984-2014 and was considered instrumental in helping grow the league during his tenure in charge. He died on Jan. 1 at the age of 77 after suffering a brain hemorrhage on Dec. 12.
Three weeks later, the league held the well-attended service to celebrate Stern's life, as Dave McMenamin of ESPN described:
"A crowd of thousands filled the lower bowl at Radio City Music Hall, as people from all corners of the sport -- players and coaches, referees and agents, public relations staffers and journalists, family and friends, league executives and team employees, Hall of Famers and the entire current New York Knicks roster -- gathered to honor Stern's 30-year tenure running the NBA."
Current commissioner Adam Silver, former NBA star Magic Johnson and Stern's two sons were among those who spoke during the event.