I know because I went to it!

I'd e-mailed the organizers and as of Wednesday Glen was going to be at the game along with "Spud" Webb and a collection of local Nebraska players. Guys like Anthony Toliver and Booker Woodfox. Unfortunately Glen wasn't there, but we had a good time.
Tonight I got an e-mail from the event organizer:
I wanted to pass along a bit of info from Big Baby. He got a call from Danny Ainge on Friday night and had to take an immediate flight to meet with him and the Staff (regarding his contract). He sent me a message today asking to send an email to all of the Celtics fan who came out to the game to see him, as he wanted to apologize for the last minute trip out of Omaha (he really enjoyed his time here).
Seeing the NJ rumor pushed me over on posting this, as its second hand information.