The AMA Pro Motocross Championship returns to Thunder Valley Motocross Park in Lakewood this Saturday for the 21st running of the Toyota Thunder Valley National. Here’s the event schedule:

• Practice and Qualifying, 8 a.m.

• Opening Ceremonies, 12:30 p.m.

• First Motos (250 Class & 450 Class), 1 p.m.

• Second Motos (250 Class & 450 Class), 3:30 p.m.