Lucasfilm and IMAX are doing something very smart with The Mandalorian & Grogu: they are letting fans sample the movie early, on the most Star Wars date imaginable. A special May the 4th IMAX event is giving fans the chance to watch the first 30 minutes of The Mandalorian & Grogu at select theaters before the film’s full release. Fandango’s event listing says the screening will preview more than 25 minutes of never-before-seen footage, and the RSVP sign-up is being handled through a theater registration form for local participating locations. That is not a small teaser. This is Lucasfilm effectively treating the opening half-hour like a theatrical sales pitch, which makes a lot of sense for a movie that has been pushed hard as an IMAX event. The official IMAX movie page lists The Mandalorian and Grogu as a Filmed For IMAX release and confirms the full theatrical release date…