I like "B" fleets, but why would they be at the Alter Cup, which would be like racing go-carts at the F-1 finals..?

Explain how you'd like to see the B fleet at Alter Pete? Would there be a "B Fleet Alter Cup" winner or something? Would it run the same course/start as the "A" fleet?

I think I know some of the answers, but would like your vision explained in a little more detail...