Are you meaning because you want to line up and see the parade? I think you would be pushing it to do both. You could see Anna & Elsa as soon as your FP+ is good, and *hopefully* would get in and out with minimal wait, but even still you would have to walk and find a spot for the parade and by 2:30-2:45 most of the better viewing spots are already taken. You could find somewhere to stand but not right on the ropes and you're going to have to manuever some crowds to do so. On the reverse side, you could wait for the parade and rush to see A & E after but with the crowds (and depending WHERE you are viewing the parade from) it could be tricky to get to PFTH in time. The first scenario would also greatly depend on how long you might have to wait in the standby line.