The Wake Up Sid star, who is currently in the UK on a promotional tour in anticipation of the release of Barfi!, said the support he receives from the British Asian public is "heartwarming".
Speaking at the event, Kapoor said: "Thank you so much for this love and support. It's really heartwarming. I'm here for the film Barfi!, which has its UK premiere on September 18, so if you have the time please go and check it out. Thank you so much for all this love. I'm very touched."
Hundreds of people turned out to meet the actor and participated in competitions and performances.
Kapoor joined participants in a performance of the 'panchi dance' taken from the film and gave out prizes for the best performance.
Starring Kapoor in the lead role, Barfi! tells the story of a speech- and hearing-impaired man and the two women in his life, played by Priyanka Chopra and Southern star Ileana D'Cruz.
The film will be released on September 14, 2012.
Watch the trailer for Barfi! below: