Sign up as soon as you get on the ship, we tried the first night and they told us it was booked for the entire cruise! Although heard through other people that most nights you could just go there and most times they were able to seat you. I watched bits and pieces while sunning in the daytime, but never seemed to find time to set aside to watch a movie , was always to much going on, lol, shows and what not. So if your really heart set on it, try and book it as soon as possible, I sorta regret not watching a movie at night.