Labour leader contender Jeremy Corbyn has addressed supporters from the top of a fire engine after a planned rally spilled out into the street because so many people turned up.
The noisy rally, saw Corbyn make a series of speeches to the packed main hall, a council chamber and outside Camden Town Hall.
Video report by ITV News Political Correspondent Romilly Weeks:
Former London mayor Ken Livingstone, Owen Jones and union leader Mark Serwotk also addressed the event, that saw long queues of people, some of whom had booked tickets while others arrived hoping to get in on the night.
It's an incredible evening when we have had to have overflow meetings in the council chamber, downstairs and on top of the FBU fire engine outside.
Left-winger Corbyn has been installed by some as a surprise front runner in the contest despite him getting on to the ballot paper at the last minute after securing nominations from MPs who had no intention of backing him in the main contest.
The leadership battle is due to conclude on September 12.
Arriving to a lengthy standing ovation, Mr Corbyn said Labour had been wrong to accept Conservative arguments on the economy and blamed it for May's devastating general election defeat.
Labour's leadership candidates, who also include Andy Burnham, Yvette Cooper and Liz Kendall, had been due to take a week off campaigning before ballot papers are sent to Labour Party members and supporters.