Killington will be a mad house - don't even think of going to Bear Mt pod that day. If you stay high in the Canyon area you could be ok but the bottom lifts will be crazy.
Pico will not be bad at all. Pico will still have freshies in the woods on Saturday.
I don't think Whiteface will be that bad except for the Gondi and Face Lift. Stay above Mid station Lodge and you will be fine.
if You French Fry when you should Pizza you are going to have a bad time