I've skied the Thanksgiving holiday weekend pretty consistently over the last 10-15 years in New England, and it's pretty crowded just about everywhere. A lot of people have the time off anyway, and are anxious to get out on the slopes for the first time. I don't know of any sure fire way to beat the crowds. Usually the mountains that have the best conditions will also have the most people. Sugarloaf can be a good bet, especially if they have a lot of early season snowfall, which is not all that unusual for them. But it's a long way to go for what's still going to be limited terrain. Last year Stowe had a lot of snow early on, had some great skiing there on the Friday after Thanksgiving, and not terribly crowded. Headed down to Sugarbush on Saturday, which turned out to be a good call, as I was told that Stowe was mobbed, so busy it wasn't worth the trouble. But you can be pretty sure that most places in VT are going to be busy that weekend.