Regarding these first night thingies... They are different everywhere, and are changed every once in awhile based on coach's decisions, etc.
For example, I was at St. Mary's "Blue & White" scrimmage a few days ago, and they played two 16-minute halves, three refs, very close to all-out. Score was kept, but reset at the half. Quite entertaining...
Back in the 80's/90's, I was lucky enough to latch onto the Jason Kidd train, saw him play some 70 times in high school, maybe 10 more at Cal. The reason I bring this up was the Midnight Madness events they would have. Both Jason years, they started full-speed (Jason's ONLY speed!) But after Jason took a hard charge about 10 minutes in, bodies falling everywhere, a time out was QUICKLY called and they took it pretty easy the rest of the way.
Enough Jason stories; I could fill this place up if I didn't stop myself.