Hi, Susieeq. No Fastpass when we were at the party last year. I don't think the
MVMCP passes are set up with the same info as a park-entry pass, so the Fastpass machines can't take them. Maybe also the party time is too short? It doesn't leave much of a window for Fastpass if it's only a 5-hour event to start with, and there are parades and fireworks that most people don't want to miss.
Also, Disney claims to limit the number of tickets sold so that the MK is less than half full. I don't know... we had no trouble walking on to rides last year, but I've heard lots of reports that people found it crowded. We're going back this year,

and because my family is all about the RIDES (couldn't care less about parades and shows), we are planning to hit the more popular rides during the parade.