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BLOOD: Today’s opportunities to donate blood are at The Bishopsgate Institute, Rye Lane Chapel in Peckham, Sainsbury's in Sydenham, South Chingford Congregational Church, and York House in Twickenham. Free, see site for terms and conditions
LAST CHANCE: The British Library's exhibition Georgians Revealed, which uses Georgian artefacts to tell the story of the era, closes today. £9, prebook, various times
NEW ART: Singaporean artist Kian Peng Ong's new installation, a sound sculpture named 'Particle-Waves', is on show at the Arebyte Gallery from today. Free, just turn up, until 10 April
LITERARY LUNCH: First Story hosts a literary lunch with author Frances Osborne, who discusses her first novel, Park Lane. Proceeds go to First Story, which organises literary projects in UK secondary schools. £60+bf, prebook, 12pm
DIAMOND SECRETS: Guildhall Library has organised a talk about the secrets of Hatton Garden, otherwise known as London’s diamond and jewellery quarter, by author Rachel Lichtenstein. £5+Bf, prebook, 6pm
OPEN COCKPITS: For one night only, the Royal Air Force Museum in Colindale stays open late to allow visitors access to some of the historic aircraft that are usually off limits, including a Spitfire. £18, prebook, 6pm
LONDON REGENERATION: London School of Economics hosts a public debate about the transformation of London over the past few years, including the regeneration of Regent Street and the construction of the Olympic Park. Led by Alison Nimmo, chief executive of The Crown Estate. Free, just turn up, 6.30pm
SPEAKEASY: Drink Shop Do hosts a Speakeasy evening, incorporating readings from up-and-coming authors including James Dawson and Sophie Lovett, with stories invented against the clock along a theme chosen by the audience. Free, just turn up, 7pm
FUNNIES: Film meets comedy at Simon Munnery's show, Fylm, which begins at Leicester Square Theatre tonight. £12.50, prebook, 7.15pm
PSYCHOTHERAPY LECTURE: Conway Hall hosts a lecture by psychotherapist Harry Dowling about the psychotherapeutic relationship. Based on his own professional experience, it will explore the effects of various types of psychotherapy. £7/£5, just turn up, 7.30pm
HORROR COMEDY: Etcetera Theatre presents The Real Horror Show, a selection of newly written sketches of terrifying tales interspersed with comedy, exploring what it is about horror films that makes people tick. £10/£8, prebook, 9.30pm
Good Cause of the Day
Plan ahead: This Saturday a Global March For Lions takes place in several cities across the world, including London. The event is organised by charity LionAid and aims to raise awareness of the canned hunting industry, which is putting lions in danger of extinction. The London branch of the event begins at 3pm, with eight mini-marches taking different routes around London, all ending outside South Africa House. If you want to take part, you can register your attendance on the Facebook page and will then be assigned a route. They are also looking for stewards to help on the day. If you're interested, you can contact LionAid via the website.
London Connection Puzzle
A new puzzle begins today, based on an idea by last week's winner, Dave Brown. In keeping with our good cause of the day (above) the first clue is LION. You'll need the second clue, at least, before guessing the London connection. It will be published tomorrow.
From the Archive
On this day three years ago, a giant pig had seemingly keeled over within the walls of the Barbican. Instead of rushing to its aid, we asked our lovely readers for caption suggestions for this picture. Which is your favourite?