We saw the afternoon matinee at our local multiplex today with a bunch of Vogon's coworkers. (Only two sat with us, but being near the front is important with a semi-potty-trained kid.) Even that late in the day, we saw two guys dressed as Jedi knights, one dressed as Darth Vader, and one dressed as a storm trooper, which delighted Laurel.
While we were waiting for the movie to start, she colored in a coloring page of Yoda printed from the Galactic Color-Bot and was thrilled when Vogon let her 'hold' the popcorn tub since she was sitting between us. She did pretty well but asked to go to the potty every time she got bored, which made for *six* trips although she only actually needed to go once. I didn't miss any major plot points, but I started to really dislike motion-sensor hand dryers.
Verdict: Well worth seeing.