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BLOOD: Today’s opportunities to donate blood are at St Olave Parish Hall in Fenchurch Street, Sainsbury's in Sydenham, Ealing Town Hall and St Paul's Centre in Enfield. Free, see site for terms and conditions
FREE WALK: GoToMidtown offer a variety of free walks around central London. Today’s starts in Holborn and visits sites from the life of 18th century writer John Gay. Repeated on Friday. Free, just turn up, 1pm
SEX DEBATE: Head to the Jerwood Theatre for a panel discussion entitled Should We Contract Our Sex Lives? Panellists include Libby Purves. £5, prebook, 6.15pm
JEWISH HISTORY: The Wiener Library hosts a free talk about Otto and Victor Klemperer, Jewish cousins who survived the Nazi regime and went on to become a well-respected orchestra conductor and diarist, respectively. Free, prebook, 6.30pm
HAT MASTERCLASS: Kensington and Chelsea College partners with London Hat Week to present a two-hour masterclass about hat design, led by established couture milliner Sarah Cant. £1, prebook, 6.30pm
BOOK LAUNCH: Dr William A Pettigrew signs his new book Freedom's Debt, about the Royal African Company and the Atlantic Slave Trade in the 17th century, at Daunt Books in Cheapside. Free, prebook, from 6.30pm
DIY ROBOT: Go back in time and have fun like a child! Build your own Lego robot at Drink, Shop, Do in King's Cross, give him/her a name and then get judged. Free, just turn up, from 7pm
WOMEN'S PRIDE: Honor Diaries is on screen tonight at the Conway Hall. It's a film that aims to break the silence about 'honor violence' and abuse against women in Muslim societies. £6+bf, prebook, 7pm
COMEDY: Have a laugh with the Big Wednesday Comedy Club at the Charterhouse bar near Barbican, an evening of stand up comedy. £7+bf, prebook, 7.30pm
CINEMA NIGHT: The underground cinematic Kennington Bioscope presents an evening of silent cinema screenings, with special guest Glenn Mitchell, at the Cinema Museum in Kennington. £2, prebook by email, 7.30pm
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Good Cause of the Day
Members of both the House of Commons and the House of Lords show off their musical skills and team up together for a Palace of Varieties charity evening, in support of MacMillan Cancer Research. Tickets go from a minimum of £185 to a maximum of £5,000 and they all include a three-course dinner, wine and entertainment. The venue is the Intercontinental Park Hotel at Hyde Park Corner. To book you ticket or table, call 020 7840 4800 or prebook by email.
London Connection Puzzle
Yesterday's clue was LION. Today's is LAMB. Think you've worked out the London connection? Email email@example.com with your guess. Or wait for clue 3 tomorrow, which should narrow things down a bit.