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BLOOD: Lots of opportunities to donate blood today. You can do so at Paddington Central Building 3, Lambeth Town Hall, Cathedral Hall in Victoria, and Bishopsgate Institute. Free, see site for terms and conditions
GLOBAL FANS: The Fan Museum in Greenwich opens its Globe Trotting exhibition today, showing fan culture and production from a global perspective. £4/£3, just turn up, until 31 December
HEPWORTH: It's 50 years since this familiar sculpture by Barbara Hepworth was pinned to the side of John Lewis in Oxford Street. To celebrate, the store will be showing off sculpture and prints by the famous artist, and installing a special window display. It'll run for about 8 weeks. Free, just turn up
WALKS: This month the Clerkenwell and Islington Guides Association offers free walks during weekdays. Pop along to St John’s Gate today and get some culture in your lunchtime. Free, prebook, until end of September.
PONGATHON: Get your pongy fix at Pongathon — a ping-pong party with live visuals, DJs and games at Rich Mix. Free, just turn up, 5-11pm
NOVEL: Hannah Kent talks about her novel Burial Rites at Waterstones Covent Garden. £4/£3, just turn up, 6pm
YOUNG BRITS: Ed Howker and Shiv Malik discuss The Jilted Generation and Britain’s shafted younger folk, at the Southbank Centre. £8, prebook, 6.30pm
DYSTOPIA: View a dystopian future London at the Institute of Contemporary Arts tonight, with a screening of Stanley Kubrick's A Clockwork Orange. £6, prebook, 6.40pm
ANATOMY: Enjoy a night dedicated to Spectacular Anatomies at the Old Operating Theatre, where you can draw a real life anatomical Venus before listening to two illustrated lectures on the human body. £8, prebook, 7pm
HEADDRESS: Exhibitionists should flock to Drink, Shop, Do tonight for a DIY class in making your very own statement headdress. Ribbons, beads, studs and pom-poms will be provided. £12, just turn up (although you can prebook via email), 7pm
HOLBORN: Learn a thing or two about the 'lovely little borough' of Holborn (or former borough, as it is now) in a talk by Fran Hazelton at the Camden Local Studies and Archives Centre. Free, just turn up, 7.15pm
Good Cause of the Day
Book ahead for Cinematic Greats by The Central Band of The Royal British Legion on Saturday 12 October, an evening celebrating the best of British film music in aid of the Royal British Legion. You'll be taken through the music of blockbusters such as Harry Potter, James Bond and Dambusters. All proceeds raised will go towards the Poppy Appeal 2013. £25/£20/£15, prebook, Saturday 12 October at 7.30pm
London Connection Puzzle
This week's puzzle, as ever, is set by last week's winner, who was Heerpal Sahota. Your first clue-word of the week is PARAGON. It's not much to go on, but if you want to have a wild guess, email matt@Londonist.com. A second clue-word will appear tomorrow. EDIT: Unbelievably, someone guessed this already, so don't bother emailing!
From Londonist’s Archive
Where are the Limits Of London? In 2010 we enlisted the help of Google Earth and an A-Z to bring you shots of 'the end of London'. If you feel an A-Z is an unreliable authority, then join the debate we started earlier this year on What Counts As London?
London Weather by Inclement Attlee
What's the biggest cloud you ever saw over London? Mine was the size of Huddersfield, though much fluffier. Large clouds will dominate the skies today. We'll see plenty of Whitby-sized cumuli, one or two with the girth of Harrogate, and perhaps the occasional Barnsley, but nothing approaching the Leeds- or Sheffield-Class megaclouds towards the top end of the Attlee scale*.
*Internationally agreed standard scale of cloud size devised in 1972 by Inclement Attlee OBE (declined) and based, for some reason, on the comparative urban sprawl of Yorkshire conurbations.