I have had one postponement due to weather in FL. In VT, we would get the assignment if we didn't already have a game that night. But, just as often, we would get another game because someone else was double booked. Often Saturday was a makeup day, and in February, it was not uncommon to have a guy work an afternoon game and an evening game due to unavailability of officials.
We will work a couple games a day sometimes in FL. Usually for tournaments. And they are always 3 crew games. When we do DHs, it is usually JVB/
VB with 3 on the second game. And on girls' DHs, we often have just 2 on the varsity game.