I'm surprised I haven't seen anything about it. It will be on NBA TV if you want to watch. Starts at 6pm.
Imagine it like Summer League, but instead of a bunch of rookies and almost-NBA players, it's a bunch of high-caliber stars and almost-stars.
I wanted to make sure people saw this, so I wanted to throw this up and hope that maybe one of the mods will make a better post about it.