You don't have to woo and date a celebrity to get invited to a red-carpet movie premiere, but it wouldn't hurt.
Work on the film as cast or crew, or have a friend on the set. This is the best way to ensure you get invited to a premiere.
If you don't make movies, then write reviews about them. Critics and bloggers may be invited to attend premieres.
On occasion, movies premiere in the towns where they were shot, and sometimes a select few fans waiting by the red carpet get picked to watch the film.
Sign up with a website that notifies you about movie premieres and reserves a place for you on the guest list.
Join a specialized group or organization, such as an environmental, religious, or academic organization. Specialized groups are invited to premieres.