In my area we usually (almost always) work a double header. Most of the schools have all contest between them on the same night...varsity in the main gym...JV in a second gym...possibly freshmen in a third (yes, many schools have that many gyms) though freshmen sometimes play on a different night.
In the secondary gym there will be JVB-JVG double header and in the main gym there will be a VG-
VB double header. Two crews assigned to work both games (typically two whistles for JV and three whistles for V).
I would not work for the rates in Mississippi.