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BLOOD: Today’s opportunities to donate blood are at The Hop Exchange in Southwark Street and St Mary Abbots Centre in Kensington. See site for terms and conditions
MUSEUMS AT NIGHT: Today is the start of Museums at Night, a three-day festival of after-hours cultural events. Find out more about London venues taking part, or come and join Londonist at the Museum of London's Digital City Late, tonight £7/£5, prebook, 7pm
THREE MINUTE SCIENCE: The Royal Institution hosts the final of the Institute of Physics' 3 Minute Wonder competition. Physics researchers go head to head to explain their work to the public in just three minutes. Free, prebook, 6pm
HORNIMAN MUSEUM: Extremes Late happens today at the Horniman Musueum. Expect music from Zimbabwe, a pop-up art show, acrobats, a surreal film screening and storytelling. £5, prebook, 6.30pm-9.30pm
WINE OR WHISKY?: Head to Bluebird in Chelsea for an Argentinian wine tasting evening, with five different tipples to taste. £20, prebook, 7pm. Whisky more your thing? The world's first dedicated whisky night market takes place on Southbank with food and whisky tastings. £10, prebook, 7pm
CANARY WHARF TOUR: Enjoy a free guided tour of the Docklands area and east London, organised by Occupy London Tours. Free, prebook, 7pm
NEW COMEDY: Number 90 Bar Restaurant in Hackney Wick launches a new comedy night tonight, Decadent Laughter. Free (donations welcome), just turn up, 7.30pm
FREE KORFBALL: Highbury Korfball Club is holding free taster sessions for anyone over 18 who wants to try the sport. It is a Dutch descendant of netball and basketball, and the only mixed sex team sport recognised by the International Olympic Committee. Free, just turn up, 7.30pm
OPERA STAR: Broadcaster, Edward Seckerson talks to Sir Thomas Allen about the opera star's life, celebrating 40 years since his Royal Opera House debut. Takes place at the London Jewish Cultural Centre. £20, prebook, 8pm
PUNK FILM: DocHouse screens The Punk Singer, a film about the life of Kathleen Hanna, lead singer of Bikini Kill and later Le Tigre, at Rich Mix. The screening is followed by a Q&A with director Sini Anderson via Skype. £7/£5, prebook, 8pm
Find more London events in our Free & Cheap events listings.
Good Cause of the Day
There is a charity lecture in aid of St Pancras Church tonight, at said church. Alan Powers will talk about the life of Paul Nash, an artist known for his War Art on the Western Front. Tickets are available for a minimum donation of £10, available here.
London Connection Puzzle
Your first two clues were PUTNEY HEATH and BATTERSEA PARK. Today's addition is TOTHILL FIELDS. What connects these three London locations? No need to email in, as several people already guessed it from the first two clues.
From the Archive
In light of the news that there may be an underground ring road coming to London, we dug out this article from 2012 about Stephen Walter's map of subterranean London. It painstakingly details buried rivers, tube lines, bunkers, sewers, government tunnels and other hypogeal secrets of London.
Have You Clocked This Clock?
This week's picture puzzles all feature London timepieces. Today, where would you find the beauty?