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BLOOD: Today’s opportunities to donate blood are at Islington Town Hall and City Temple by Holborn Viaduct. Free, see site for terms and conditions
HUSH: Explore the emotions of sound with The Hush, an innovative part-gig, part-play, part-installation at National Theatre's The Shed. £20-£12, prebook, until 3 August
HERITAGE: A new exhibition at Wellington Arch examines how campaigners like John Betjeman saved many historic buildings in the face of the over-keen wrecking ball of the 1960s and 70s. Plus, the buildings that didn't make it, the origins of the listing system, and the conservation movement. Free with general entrance fee, just turn up, until 15 September
SEX ON SCREEN: A film screening that explores how experimental filmmakers have addressed the issue of sex as a political gesture. Films include Un Chant d’Amour by Jean Genet, Fuses by Carolee Schneemann and Sodom by Luther Price. Free, prebook, 6pm
60s AT 50: Join the Archives for London Summer Soiree to celebrate the music, fashion and fun of the swinging 60s at Duke of York Square, Kings Road. Free, just turn up, 6pm
BOOK LAUNCH: Tired of London’s Tom Jones launches his new book, Mad Dogs & Englishmen, at Stanfords. We'll be there! Free, prebook, 7pm
MOOCHIN' AND MESSIN': Bring your dancing shoes and learn how to Black Bottom (cousin of the Charleston) at this prohibition dance workshop at the Institution of International Visual Arts. £8/£6, prebook, 7pm
SCIENCE IS FUN: This month's Science Showoff — a frenetic set of talks from 10 speakers — takes place upstairs at The Miller, London Bridge. Free (but charity donations encouraged), just turn up, 7pm
LISTS: Calling all list lovers, let your list lust run wild at The Gallery Cafe in Bethnal Green today with I Love Lists!. £5, prebook, 7.30pm
CONDUCTING: Go on an aurally-illustrated journey through the world of conducting at St Monica's Parish Centre with musical director Adrian Brown. £10, prebook, 7.30pm
OUTDOORS: Make the most of this glorious weather this evening with some alfresco music, drinking and dancing at Strongroom Bar. Free, just turn up, 7.30pm
DISSENT: Mark Thomas wants to tell you all about 100 minor acts of dissent, at the Canada Water Culture Space. £10/£8, prebook, 7.30pm
GIG: If you're a fan of vintage-Bollywood-inspired psych-surf-funk music (and who isn't?) then get yourself down to Village Underground tonight for the London debut of 11-piece band The Bombay Royale. £11, prebook, 8pm
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Good Cause of the Day
Live at St John’s (Music for ChildHope), curated by Sound:Check, is a charitable concert featuring a selection of UK artists including Alice Russell, Gideon Conn and Bridgette Amofah. Taking place on Friday 26 July at St John's Church in Hackney Central, each artist will be given a 20-minute acoustic set with nothing but a church organ, a baby grand piano, a string section, and an all female choir to accompany them. All profits of this live event will go to ChildHope, an international children's charity that works with over 45,000 children around the world to help prevent child exploitation and assist those affected by poverty, AIDS and social injustice. £20/£15, prebook for cheaper tickets, Friday 26 July at 7.30pm
London Connection Puzzle
Yesterday's keyword was MT. Today's is GI. What's the London connection? Email email@example.com if you think you have it, or wait for a third clue tomorrow.
London Weather, by Inclement Attlee
Another day of glorious sunshine. Think it's hot now? Just wait until they finish assembling the Cheesegrater complex. Not many people know this, but the skyscraper on Leadenhall Street is actually just one of three identical neighbours, currently under construction. As this exclusive architect's impression shows, each building will house a stack of giant gas fires. The idea is for the Square Mile to compete with the likes of Dubai and Abu Dhabi in terms of both novelty skyline and intolerable all-year heat. The trefoil structure also serves as an artistic pun or rebus, visually informing City workers: "You're fired". (Editor's note: Attlee, you'll be fired if you don't stop concocting these stupid, tenuous 'forecasts' that have nothing to do with the actual weather or, indeed, reality.)