The summer season at the box office comes to an end with this weekend's Labor Day holiday, and, as usual for the holiday, moviegoers are likely to find plenty of good seats in the theaters. The Wicker Man, starring Nicolas Cage, is expected to open in first place, but analysts indicate that it is likely to gross only about $15-17 million, perhaps a million or two more than last week's winner Invincible, which is likely to take second place.