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BLOOD: Today's opportunity to donate blood is at City Temple by Holborn Viaduct. Free, see site for terms and conditions
CITY LIT: City Lit launches a new science and nature course programme this month. Today, discover the plants and animals that live alongside us in London, with Mathew Frith of the London Wildlife Trust. £12, prebook, 11am
FESTIVAL: Sydenham Arts Festival started over the weekend and continues today with a cryptic crossword evening, a playwriting workshop and the first heat of the So You Think You're Funny? competition. See website for full listings, until 14 July
OLYMPICS: A new exhibition at City Hall shows off evocative paintings of the London 2012 Olympics by Nicholas Garland, also featured in a new book. More info on the City Hall web site. Free, just turn up, until 31 July
CANADA DAY: It's Canada Day London! Head to Trafalgar Square to get involved in the action, which includes a culinary programme, hockey tournament, yoga class, face painting and even appearances by the Mounties. See website for full listings, 10.30am-10.30pm
LOVE LETTERS: Share your love of London with The Love Lettering Project, where you can write anonymous love letters to where you live. What do you love about London? Head to the north east corner of Trafalgar Square today and tell all. Free, just turn up, 10.30am-6pm
TWILIGHT SCIENCE: The opulent Royal Society opens its doors for the first night of its week-long Summer Science Exhibition. Tonight's adults-only event lets you talk to some of the UK's top scientists, take part in a science quiz (hosted by Londonist's Matt Brown), learn the molecular science of cocktails, and watch the ever brilliant Festival of the Spoken Nerd do their funnies. Free, just turn up, 6-10pm
ARABIC FICTION: Rabai al-Madhoun discusses his novel The Lady from Tel Aviv, shortlisted for the International Prize for Arabic Fiction 2010, at Foyles. Free, just turn up, 6.30pm
SOUND ART: Japanese sound artist Tetsuya Umeda performs at Caroline Gardens Chapel, making connections between sounds, kinetics and sculpture whilst exploring the atmospheric former chapel building. £5/£3, prebook, 7.30pm
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Good Cause of the Day
Art Saves Lives is a London-based not-for-profit organisation dedicated to providing free, inspirational art experiences for marginalised and underprivileged artists in the UK. Art Saves Lives Independence Day on 4 July is an evening of live music and song at Broadway House, to raise money for sick children and their families at Great Ormond Street Children's Hospital. £15, prebook via firstname.lastname@example.org, Thursday 4 July at 8pm
London Connection Puzzle
Last week's four clue-words (one revealed each day) were Donald, Terry, Richard and Norman. Several people spotted that these are all prominent architects, but only Andrea Casalotti worked out the full connection. Buildings by the four architects are grouped together on Wood Street in the City of London. Donald McMorran designed the police station; Terry Farrell was the architect of the hulking Alban Gate building, which straddles London Wall; the distinctive coloured ventilation and lift shafts mark 88 Wood Street as an archetype from the studio of Richard Rogers; and Norman Foster contributed 100 Wood Street. So congratulations to Andrea, who will set this week's puzzle, starting tomorrow.
London Weather, by Inclement Atlee
A third day of sunshine? Surely some mistake? But watch out for that menacing gang of clouds, currently staking out the skies above London. This lawless band of nebulous varmints is plotting to run roughshod over the capital from tomorrow, kidnapping the sun and imposing a climate of grey oppression over the town. In summary: where's Clint Eastwood when you need him?