You might even want to ask the people working at the theater how many tickets they have sold vs. a regular or blockbuster night. And what they are expecting from the movie via sales.
On another stock I am in, the board did a lot of investigative DD and it really worked out for us. Just trying to think of everything. :)
That might not be a good gauge. I went to see lotr midnight screening opening day and got in without ticket reservations in advance. It was packed though :) have fun tonight man