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BLOOD: Lots of places to give blood today. Go to the O2 Centre in Swiss Cottage 9.40am-12.20pm and 2-4.40pm, Holborn Viaduct 9.45-11am and 12.15-4.15pm or The Hop Exchange in Southwark 11am-1.30pm and 3-5.30pm
TOMATO FIGHT: There's a tomato fight planned for Canary Wharf at lunchtime – get in touch with Mission Wraps asap if you want to take part. Hopefully this won't suffer the same fate as the one in Hackney earlier in the year... Free, prebook if you want to join in or just turn up to watch, 12.30pm
MARS: Professor Carolin Crawford talks about the robots exploring Mars, and what they’ve found, at Gresham College. Free, just turn up, 1pm
DOCTOR WHO: Jenny Colgan, Cavan Scott and Mark Wright are celebrating 50 years of Doctor Who at Waterstones Gower Street £5/£3, just turn up, 6.30pm
SCIENCE LATES: The Science Museum opens until 10pm with events covering game theory, maths and the Underground, 1860s photography and a silent disco. Free, just turn up, from 6.45pm
PATHOLOGY: Get a history of pathology in 50 objects with Dr Suzy Lishman at the Old Operating Theatre near London Bridge. £6.20, just turn up, 7pm
CURRY: Eat a veggie curry at the Gallery Cafe before enjoying a comedy show with Bobby Mair, Omar Hamdi, Ben Adams and Harriet Kempsley in the literally titled Comedy and Curry. £10/£5 show only, just turn up, 7pm
JEWISH HISTORY: If you're enjoying Simon Schama's TV series The Story of the Jews, he's talking about his research with David Aaronovitch at the Southbank Centre. £15/£12, prebook, 7.30pm
BINGO: The unmissable hip-hop octogenarian Ida Barr hosts Bingo Cabaret at the Princess Victoria in Shepherd's Bush. Also includes a three-course dinner. £45, prebook, 7.30pm
SPOKEN WORD: The Homework regulars (including Joe Dunthorne, Ross Sutherland, Luke Wright and Tim Clare) have produced monologues – some will be performed by actual actors at Bethnal Green Working Men’s Club. £5, just turn up, 8pm
TALL TALES: Fans of Radio 4's Warhorses of Letters should head to the Good Ship in Kilburn for Tall Tales, where writers Marie Phillips and Robert Hudson preview the next series, plus other very funny comedy writers telling stories. £5, just turn up, 8pm
Good Cause of the Day
Crimestoppers has just launched a new campaign to catch people who live in luxury off the proceeds of crime. The crime-fighting charity wants to hear from you if you have evidence of a person or business benefiting from illegal activity. The scheme is explained in detail here, including how Crimestoppers works with the police. You can contact Crimestoppers anonymously on 0800 555 111 or through www.crimestoppers-uk.org.
From the Archive
A year ago today, Time Out went free. We critiqued the new look, finding evidence that too much champagne had been quaffed at the launch party.
London Connection Puzzle
Yesterday's clueword was 38. Today's is 24. What's the London connection? Send solutions to firstname.lastname@example.org. EDIT: lots of people have now guessed this, so no need to write in.
London Weather by Inclement Attlee
Cloud, mist and fog are the watchwords of the day. Old Granny Attlee once gave me the following tip, which I find useful for navigating through such smogs. First, hook up your vacuum cleaner to a mobile generator. Next, stow it all into a very large rucksack, and sling it over your back. You can now use the hose to suck up any lingering fog as you walk along the street. The captured vapour can even be recycled. Simply sell the swollen vacuum bag to a gig promoter, who can turn its contents into a cost-effective 'dry ice' stage effect at a later date. As a secondary bonus, people might think you're a Ghostbuster.
Want to provide the forecast? I'm going on a short holiday at the end of the week. This will mean no forecasts for a couple of days. So to fill in, I'm going to hand the reins over to any reader who wants to have a go at meteorological prediction. There's a catch — you can't just write the forecast down. You must draw, sculpt, photograph or otherwise create something to represent the London skies. We need forecasts for both Monday and Tuesday next week. So please send any entries ASAP to email@example.com, with subject line 'Attlee's minion'. No bodily fluids.