When we went to Mickey's Very Merry Christmas Party in November, I made FP+ for Peter Pan (3:25), Big Thunder Mountain (4:30), and Winnie the Pooh (5:30). We arrived at MK at 3:40 and they were already letting party guests in. We wandered up to Pan and rode before 4:25, then over to BTMRR and rode immediately. DD then rode Splash with an advertised 20 minute wait time (and it was) and we headed off to Pooh. We then rode Small World, Buzz Lightyear, and TOmorrowland Transit Authority before going to the 7:45 Totally Tomorrowland Christmas show. I don't know how much of this you'll be able to do without FP+, and it will all depend on what time you go into the party, but this is what we did.