One of Europe's most dynamic and popular pride celebrations, London Gay Pride officially takes place in late June - the dates this year are June 18 to June 26, 2016. It's one of the most well-attended such events in the world, drawing more than 750,000 participants. Three years ago was an especially huge gathering, because London Pride coincided with WorldPride (which will next take place in conjunction with Madrid Gay Pride in 2017) and EuroPride (which is in Amsterdam this year, and in Madrid as part of WorldPride in 2017).
The big day in London is Saturday, June 25, with the massively well-attended London Pride Parade, which takes place from 1 pm until around 4:30 pm - it begins at Baker Street at Portman Square and makes its way southeast through Oxford Circus, Soho, Piccadilly Circus, Charing Cross, and down to Whitehall. Then throughout the afternoon until well into the evening, the London Pride Festival in Trafalgar Square features a slew of big-name entertainers.
There are all sorts of related Pride events taking place during London Pride Week, including the Pride Arts Festival, film and theatrical presentations, concerts, parties, workshops, sing-along parties, an LGBTQ tour of the Victoria & Albert Museum, a Pride in the Park event in conjunction with UK Black Pride, and much more. Check the London Gay Pride events page for more details on what to see and do during the city's massive LGBT celebration.
London Gay Resources
Check out About.com London's excellent primer on the London Pride Celebration, as well as such useful gay London resources as TimeOut London's LGBT site and the Patroc London Gay Guide. Also take a look at the excellent GLBT site produced by the city's official tourism organization, the London Tourist Board.