Moto X, Superbikes, Flat track, Grass track just about any that has more than one race per meeting.
Generally the points from two races are added together to give a finishing position from which Championship points are awarded. So somebody can easily win the first race and have 20 points, crash in the second and end up taking home 8 or 10 Championship points.
Perhaps the most direct comparison would be Supercross where they have to qualify to make the night show then compete in a series of heats, semis and last chance races but Championship points are only awarded on position in the final.