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BLOOD: Today's opportunity to donate blood is at Sainsbury's Car Park on Dog Kennel Hill. Free, see site for terms and conditions
ART: Since the injury of a friend in Afghanistan, Carl McCrow has been on a quest to deactivate as many guns as possible. His artwork at gallery@oxo puts these guns in the public view. Free, just turn up, until 14 July
'LYMPICS: Photos of glory moments from the London 2012 Olympics go on show in City Hall today. Free, just turn up, until 26 July
STREET ART GOES UPMARKET: Work by famous street artists, including Thierry Noir, Christiaan Nagel and, in something of a coup, graf writer Zomby, will be projected onto the atrium walls of ME London in Aldwych between 3pm and 8pm daily. Free, just turn up, until 10 August
ASTHMA: Eat your sarnies while you listen to a lecture about the mysterious epidemic of asthma in the UK during the last half-century. Led by Professor Seif Shaheen at Wellcome Collection. Free, just turn up, 1pm
MORBID ANATOMY: More learned macabre talk at the Last Tuesday Society, where Dr Andrew Chesnut discusses the growing cult of Santa Muerte, a pseudo-Catholic saint associated with death. £7, prebook, 6.30pm
KORFBALL: What's that? Have a go and find out how to play this mixed team ball sport on Clapham Common. First session free, register online, 7.30pm
MUMMY’S CURSE: Learn about the cases of Thomas Douglas Murray and Walter Herbert — two Victorian gentlemen alleged to have been cursed by artefacts — with the Moot With No Name at The Devereaux. £3/£2, just turn up, 7.30pm
POETRY: Performances from Jacob Sam-La Rose, six up and coming poets from London and another six from Teesside with Project Break-Out North/South at the Southbank Centre. Free, prebook, 7.30pm
TONGUE FU: Tongue Fu returns to Udderbelly with Ty, Dizraeli, Femi Martin and Luke Wright in tow. £12.50, prebook, 9.15pm
If you fancy taking some street photographs in east London this weekend, David Gibson is running one of his small workshops that will cover the history and different approaches of street photography. You will get the chance to take photographs but crucially be given honest and constructive feedback on all your photography. David is a well known London street photographer whose work has been widely published and exhibited.
You can contact David through his Facebook page. Tell him Londonist sent you and get 15% off.
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London Connection Puzzle
Yesterday's clue was SA, today's is AG. What's the London connection? This one's bloody difficult, so we'll give you a further clue...it's a sporting connection. Email firstname.lastname@example.org if you think you have the answer.
London Weather, by Inclement Attlee
A rare but oft-depicted phenomenon can be observed on the surface of the sun today. Sometime around noon, an alignment of magnetic fields and charged particles will lead to a coronal mirth ejection. From London, the sun will manifest a broad grin, and briefly adopt a pair of shades. A particularly celebrated example of this stellar anomaly was recorded in the early 1990s. Astronomers at the time not only noted the sunglasses and smile, but also detected emissions of song, apparently extolling the virtues of low-fat spread (then known as margarine) "made with real sunflower oil".
Health warning: it is a criminal offence to stare at the sun.