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With sewers, water pipes, bunkers and basements, it's a maze under this city. We've been doing some digging ourselves to see how deep London goes.
Dinner plans tonight? How about gorging on the finest Ethiopian and Eritrean food in London?
If you're in a last minute Mother's Day rush to buy a present, how about something from one of London's best chocolate shops.
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Things to do today:
LAMBETH PALACE: The oldest continuously cultivated garden in London, rarely opened Lambeth Palace welcomes the public today. Get started on spring with majestic magnolia, flowering cherries and a mound full of Narcissi and scented bulbs. £5, just turn up, 12pm-3pm
SPITFIRE GIRLS: In the second world war, a group of London ladies took to the skies, flying Britain's war planes from the factory to the battlefield. Join journalist Jacky Hyams at the National Archives as she discusses the brave women of the Air Transport Auxiliary and their contribution to the war effort. Free, just turn up, 2pm
ULTIMATE DINNER PARTY: The flatmates at the Little Yellow Door invite you to move in with them for this evening and experience dinner their way. At the hands of Mad Max, you'll enjoy a four-course meal, punch and game-packed after-party. It's the ultimate flat share experience for just one evening. £35, prebook, 6pm
CELILIDH CLUB: Tear up the floor at London Welsh Centre with an evening ceilidh. Advance tickets are already sold out, but you can still grab some on the door if you fancy step dancing into Saturday. £18.15, just turn up, 6.30pm
TICK TACK CLUB: Take a trip to 1921 for tonight's Tick Tack Club. London's for the taking and you're thrown into the criminal underworld for the evening. Shrug on your best vintage threads and head through a secret door to a gambling den for games, dinner and dancing. £45 (with dinner), £15 (den entrance), prebook, 7pm
COMEDY: Join Londonist fave Jay Foreman (he's got a song about every single tube station) along with Nick Dixon, Rachel Wheatley and Javier Jarquin for a night of free laughs in Islington. 8pm
CIRCUS NIGHT: Some of the city's best cabaret performers bring their skills, thrills and showmanship to Acton for Aeronaut Circus Night, followed by DJ sets till the small hours. £10, prebook, 9pm
MICRO DISCO: Feeling all 70s? Get your disco grove on a Ruby's, Dalston. With classic hits from the likes of Chaka and Dr Packer, plus modern edits — the only thing micro about this party is the intimate setting. Free, just turn up, 9pm
Browse and book more London events at our tickets site powered by YPlan.
Good cause of the day
This Sunday, do a breakfast run for charity at the Starfish Annual Breakfast Run And Picnic at Clapham Common. Starfish supports orphaned or vulnerable children in South Africa by working with community organisations. Choose from a range of distances: 5k, 10k or 15k, throw on your Starfish t-shirt and get running.
All runners receive a breakfast hamper so you can picnic on the common afterwards. There's also a bouncy castle, tombola, stalls and 100m dash for kids. £15.07-£32, 10am, Sunday 6 March