RHS Chelsea Flower Show (Late May (typically 5 days ending last Saturday of May)). Annual horticultural show at Royal Hospital Chelsea; 2025 edition ran 20–24 May. One of the most prestigious garden shows in the world.
Trooping the Colour (Second Saturday of June). Annual military parade celebrating the sovereign's official birthday; 2025 held 14 June at Horse Guards Parade with appearance on Buckingham Palace balcony. Begun under King Charles III following Queen Elizabeth II's…
Wimbledon Championships (Late June to mid-July (two weeks)). Annual Grand Slam tennis tournament at the All England Club, Wimbledon; the oldest tennis Grand Slam, played on grass. 2026 Championships: 29 June – 12 July.
Buckingham Palace Summer Opening (July to late September). Annual public opening of the Palace State Rooms since 1993; visitors explore 19 State Rooms. 2026 dates: 9 July – 27 September.
Bonfire Night (Guy Fawkes Night) (5 November (annual)). Annual commemoration of the failed Gunpowder Plot of 1605; observed with bonfires and fireworks across Great Britain. Originating Act of Parliament passed 1605.
New Year's Eve Fireworks on the Thames (31 December). Annual ticketed fireworks display launched from the London Eye and Thames barges at midnight; ~100,000 spectators; 12 minutes, 12,000+ fireworks — billed as Europe's largest annual firework display. Tradition…