The evening event took place at the Society of the Middle Temple in London and was attended by more than 800 guests. The venue was divided into four main areas, dressed to resemble sets from Harry Potter and the Prisoner of Azkaban.
GL Events Owen Brown supplied its Premier Pavilion marquee for use as a viewing area for VIP guests and press during the arrival of the film's stars on board the 'Knight Bus'. Special effects were created by SFX, while Orbital and Fantastic Illusions supplied the sound and lighting.
The Admirable Crichton, meanwhile, was responsible for catering.
Imagination event planning manager Nichola Goad said: "We were delighted with the event - it produced a huge amount of press."