Well..... All of the parks are going to be crowded.....
If you are looking for the least crowded, though..... I would try:
Epcot on Friday morning
Magic Kingdom on Friday night. (Please note crowds are much better after Wishes and you may be able to hit several attractions between 10:15 and midnight if you hurry!)
Animal Kingdom or Epcot (or both) on Saturday.
MGM is going to be tough either day with the Osborne lights and EMH on Saturday.
Good luck!
Mav