Beginning skiers won't be able to ski three day's straight. By the end of day two they will be plently stiff and sore. If you are based in the DC/Baltimore area, I'd recommend avoiding the holiday crowds and choose another weekend. When you are in a learing situation, few things are more intimidating than a crowded environment. And you can count on crowds during holiday weekends along the entire East Coast.
I got roped into taking some never-ever neighbors (Dad and 2 pre-teen girls) out to Liberty last year on this weekend. It was the least skiing I have ever done in a day - there were 30+ min lines on the beginner lift(s) at Liberty throughout the afternoon. It was a complete waste of time in terms of getting some miles under their feet.
Other years, when we have been able to go where ever we wanted, we have had very good luck at smaller non-destination NE resorts that are surrounded by larger, closer-in destination resorts. Over the years, Magic, Bromley, Bristol, Denton, Pico and Burke have worked well for us during holidays, but I suspect you (rightfully) don't want to drive this far with a group of beginners.
BTW, I agree totally with JohnL's comments about them being sore after two days, and trying (if at all possible) to go on some other weekend.
Tom / PM
Tom / PM
On any long weekend, Saturday is the worst day and Monday is the best day as far as crowds are concerned. Your group might consider Cross Country skiing at White Grass/Canaan Valley/Black Water Falls SP on Saturday and switching to Alpine for Sunday and Monday. Hard core Alpine skiers might try and get some additional turns in during one of the night sessions at CV or Timberline.