I'm not sure you will even need to - assuming you are taking 80 from the Bay Area you can supercharge in Truckee before heading over to Squaw and you should be fine for the weekend and then just Supercharge on your way out if you used up much battery.
They do have chargers scattered about but I think the best ones are L2 ones that are 20 or 30-amp only. Truckee isn't that far away and if you topped off there, it's very close to Squaw, only a quick drive and given the amount of traffic on that stretch, maybe only 15 or 20 RM of usage to get there.
Even if you came up on Friday, charged at Truckee and went back and forth to Tahoe City from the Village over the weekend for food and drink you will still have plenty of charge available Sunday, then just hit the Truckee SC on your way home.