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BLOOD: Give a pint at the West End Donor Centre, 26 Margaret Street W1, just turn up, 8am-7.30pm
CURVES: The Barbican's Curve Gallery is always worth a look (remember Rain Room, the birds and finches, or the 10-pin bowling video games?). A new exhibition by Ayse Erkmen on the artistry and craft of scenic painting. Free, just turn up, till 5 January.
MERMAIDS: Discover mermaids through history, from London coffee shops to the Wellcome Collection, with a talk at the Hunterian Museum. £4, prebook, 1pm
VILLAGES: Find out the secrets of the 'village' of Piccadilly and St James's, at the Guildhall Library. Free, register in advance, 2pm
PING PONG: It's Pongathon at the Prince of Wales in Brixton. Grab your paddle, whack some balls, eat stone-baked pizza. Free, just turn up, 5pm
LITTLE BITES: Chow down on grub from Bleecker Street Burger, Mama Jerk's and Willy Wonka's GCS Bake Team, drink and listen to tunes at Little Bites in Shoreditch. It's all to raise money for The Little Princesses Trust, which provides real-hair wigs for children who have lost their own hair through cancer treatment. £4, just turn up, 5.30pm
COMPASSION: Karen Armstrong and Camila Batmanghelidjh debate how we can make the world a more compassionate place in the first of a series of How To Change The World events at St Paul's Cathedral. Free, just turn up, 6.30pm
BOOKS: Tracy Chevalier (The Last Runaway) and Charlotte Mendelson (Booker long-listed Almost English) talk about their work at festival Archway With Words. £7, just turn up, 7pm
CLIMATE CHANGE: Neatly coinciding with the IPCC's latest big meeting on climate change, this month's Cosy Science looks at the various projections. Chris Brierley is at the Cittie of Yorke pub. Free, just turn up, 7pm
URBAN WANDERINGS: Tonight's Urban Wanderings event at The Barbican includes several London-themed films from John Smith. £10.50, prebook, 7pm
FILESHARING: Watch documentary The Pirate Bay: Away From Keyboard, about what happened to The Pirate Bay's founders when they were sued for damages by the media industry, at the Oval Space. £7. 50/£6, just turn up, 7.30pm
QUIZ: The You’re Going to Need a Bigger Boat Film Quiz is upstairs at The Ritzy in Brixton. £4, first come first served, 7.30pm
Good Cause of the Day
Go Sober For October is like a New Year's Resolution, or giving up alcohol for lent, but with two added benefits: (1) you can use it to raise money for Macmillan Cancer Support; (2) 'Go Sober' and 'For October' rhyme, and we like a good cause that rhymes. So, tell everyone you know that you're giving up the bottle next month, collect some sponsorship money from them, and send it off to Macmillan. If you feel like you've had too many nights out on the town lately, this might just be an everybody-wins situation.
From the Archive
On this day in 2010 we looked at plans for a curved escalator, designed by a London professor.
London Connection Puzzle
This week's puzzle is set by last week's winner, Alexandra Westcott. Your first clueword is '38'. No guessing just yet. Have a ponder, and get ready to guess the London connection tomorrow, when the second clueword is revealed.
London Weather by Inclement Attlee
Due to government cost-cutting measures, there will be 20% less weather today. Temperature is ring-fenced at 20°C, but we'll see a marked diminution in both wind-speed and daylight. The sun will rise in the south-east and set in the south-west, keeping the semblance of a normal autumn day while cutting out several hours of wasteful irradiation. Labour has called the cuts 'reckless', promising to reverse the policy if elected in 2015. "We will, in addition, reinvest in the weather, implementing an additional season between summer and autumn to help hard-working tax payers cope with the difficult transition," said an anonymous, high-ranking source not close to Ed Miliband.