I have raced this the past 2 years and your class will have both motos run on the same day unless they changed something from last year. some classes run on sat and some on sun but they dont split it. you can figure out which day here:
MX Sports - Loretta Lynn's AMA Amateur National Motocross Championships it sucks i cant go this year its a awesome race. but as for the low turnout i dont know last year in schoolboy there was only like 13 of us but the C classes always have the biggest turnout.