The premier of the film Benjamin Britten - Peace and Conflict at the weekend was delayed after a woman collapsed.
More than 100 people attended the event on Saturday at the Auden Theatre, Gresham's School, in Holt, where the composer spend some of his school years.
An East of England Ambulance Service spokesman said a land ambulance and rapid response vehicle were called at 2.12pm after a woman in her 70s collapsed from a 'sudden illness'.
He added: 'She regained consciousness at the scene and was taken to the Norfolk and Norwich University Hospital.'
He said her condition was not life-threatening.
Audience member Conal O'Donnell, 62, from Dereham, said the woman collapsed during a question and answer session with film director Tony Britten and Britten biographer Dr Paul Kildea.
He said Dr Henry Crawley, another audience member, helped the woman before the paramedics arrived. The film premier was delayed by about 20 minutes, Mr O'Donnell added.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here