Tickets for a back-to-back marathon screening of all six Star Wars films sold out in five minutes on Monday.
Hayden Christensen will attend the premiere on 16 May
Fans had queued all weekend to obtain one of the 1,000 "Galactic Passports" for the day-long event, to be held at London's Empire cinema on 16 May.
"This is the fastest-selling screening we've ever had at the Empire," said cinema spokesperson Katy Harris.
The marathon begins at 0700 BST and ends with a preview screening of new Star Wars film, Revenge of the Sith.
The film's UK premiere - attended by stars Hayden Christensen, Anthony Daniels and Peter Mayhew - will take place at the Odeon Leicester Square on the same day.
An army of stormtroopers will be "on guard" in the area, while the Royal Philharmonic Orchestra will give a free concert of Star Wars music.
Meanwhile, more than 30,000 fans are returning home from the largest official Star Wars convention in the US.
Star Wars director George Lucas was the main attraction at Celebration III, held in Indianapolis, ahead of the new film's release on 19 May.
"The whole phenomenon began with the fans," said Lucas, who attended science fiction conventions as part of his research prior to making the first Star Wars film.
Star Wars creator George Lucas spoke at the Indianapolis event
"That allowed it to be a huge success from the first day the movie opened," he continued.
As well as Lucas himself, the convention offered fans the chance to snatch up movie action figures and watch the Stormtrooper Olympics or the DroidYard 500 race, featuring figures modelled on R2-D2.
Steve Sansweet, head of fan relations at Lucasfilm, said the four-day event proved so popular that fans from Mexico, Japan and Europe chartered jets to attend.