The Huck FInn series is legit, has 5 competions: Shanty Creek, Alpine Valley, Brighton, Pine Knob, and Crystal
Then there is the Middle Earth series in the UP which is also pretty sick.
Also, the Mt. Holly Competition, towards the end of the year
Just to name a few: Marquette has 3 or 4, boyne has 2 or 3, nubs nob has friday night fights, and in grand rapids, there is a downtown railjam