If this issue is cash flow in May, then I think the best bet is for pass holders have their season pass expire on 5/1 and have to pay for day tickets. Throw the pass holders a bone by offering them 50% off window rates.
I think I've paid $50 to ski K late April the past couple of seasons. If I were a pass holder, I'd have no qualms with spending $25 a day if that's what it took to keep the mountain open a few more weekends.
+1