Sorry, just saw this now...
Have you started or finished?
In any case, for future reference...
What kind of look are you going for???
Documentary, real feel? Or Cinematic look?
If its Documentary style, shoot everything in 1080/30p.
If its Cinematic look then shoot everything in 1080/24p.
There is a way to convert the frame rate down from 60p to 30/24p. But understand that when you are doing this, you are going to get a slow motion effect. I am sure there are other options on the x920, dig deep into the menu. I am sure everything coming out of the x920 isn't slow motion.
Anyway, depends on the editor. What editor do you use?