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GIVE BLOOD: St Olave's Parish Hall near Fenchurch Street station is the place to go if you want to donate blood today. Free, just turn up, 9.30-11am and 12.15-4.15pm
FOOD: The Taste of Christmas fair opens at ExCel and runs through the weekend, with tastings, stalls and other foody delights. From £18.50, prebook or turn up, 10am-6pm
WILDLIFE: See an exhibition of photos of endangered animals by Roger Hooper at OXO Gallery on the Southbank. Free, just turn up, all day
CHOCOLATE: The London Chocolate Festival starts at the Southbank Centre tomorrow. Buy it, try it, salivate all over it. (Don't salivate all over it.) Free, just turn up, 11am-8pm
STREET FOOD: Hackney Downs Studios on Downs Road have a street food market with plenty of chomps and seasonal cocktails. Free, just turn up, 5-12pm
DESIGN: The Design Museum opens late, with festive craft and design activities, late night shopping and entry to exhibitions. £11, just turn up, 6.30-10pm
PANTO: See Pricilla Presley as Snow White, in New Wimbledon Theatre's seasonal show. Starts today and runs till 13 January. From £10, prebook, 7pm
MORE PANTO: Paul O'Grady's Aladdin opens at the O2 today, with regular performances until 5 January. From £20, prebook, 7.30pm
MUSIC: You sing, they play ukelele. The KaraUke evening at the George, off Charing Cross Road sounds like a heap of fun. Free, prebook, 7.30pm
COMEDY: Camden Head has a club night from Laugh Out London with Helen Arney and her uke headlining. Also on the bill are Pat Cahill, John Kearns, Turonimo Numpty (Grainne Maguire and Lou Sanders), Phil O’Shea and Jack De’ath. Stuart Laws MCs. £3, just turn up, 7.30pm
BOOKS: Ben Goldacre talks about his latest book Bad Pharma at the Southbank Centre (7.45pm, £10), followed by science and rationalist comedy from Robin Ince. £10, prebook, 7.45pm
MUSEUM LATES: Unwind after work with a spot of culture at the British Museum, Natural History Museum, V&A, National Gallery or National Portrait Gallery. Free, check websites for closing times and events.
ROLLER SKATE: The Friday Night skate starts at Wellington Arch. Anyone who feels competent on skates is welcome to join. Free, just turn up, 8pm.
Random London Fact Of The Day
Did you know that it's possible to walk from Trafalgar Square to Greenwich without crossing over any roads? Here's how. Vic Keegan, who first made us aware of this fact, now reckons he can get from Trafalgar Square to Islington, by means of the Regent's Canal from Limehouse.
London Weather
The weather pulls more costume changes than a pantomime dame with a cotton allergy, offering everything bar a plague of locusts. And what the McCaskill's happening at 17:00? Horizontal rain? Late result? Fill in your own weather? The mind boggles. More confusion over at BBC Weather.
Secret Hidden False Rumour Of The Day
Many think that The Wombles is a simple children's tale, but the books and TV show are based on actual events. Names have been changed, and the location switched from Hounslow to Wimbledon, but the essential story of intelligent mammals getting into scrapes while collecting litter is more documentary than work of fiction. #secrethiddenfalserumourclub
