Have you considered Amtrak? It would work for the Sat/Sun at Mission Ridge. Overnight train to Wenatchee or Leavenworth; someone nice can pick you up at the station, with plenty of time for breakfast, caffeine of your choice, and a day of skiing. Return trip Sunday evening after another satisfying day of skiing.
The Amtrak from Whitefish does stop in Wenatchee. Since my schedule is fairly open I would be happy to meet you at the station. There are plenty of us to provide rides. No need to keep it to only Mission Ridge, if you stay in Leavenworth you can hitch a ride to Stevens with us as well. We can make it work.