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BLOOD: Today’s opportunities to donate blood are at Bishopsgate Institute, Battersea Arts Centre in Lavender Hill, Chiswick Town Hall, Sainsbury's in Sydenham and South Chingford Congregation Church. See site for terms and conditions.
SCIENCE FUN: The Royal Society’s Summer Science Exhibition begins today, inviting the public to learn about current research, with plenty of fun, games and live experiments to jolly things along. Free, just turn up, until 6 July
FILM EXHIBITION: A new exhibition opens at A&D Gallery in Marylebone today. State Of The Art Cinema showcases 75 contemporary film posters and photographs, split into six themes including Britain on Screen and Family Heroes. If you have a smartphone, you’ll also be able to access extra audio-visual content. Free, just turn up, until 12 July
PEPYS’ HOLBORN: See sites in the Holborn area referred to by Samuel Pepys in his famous diary on this guided walk. Starts at the GoToMidtown shop at 56 New Oxford Street. Free, just turn up, 5.30pm
MEET THE MAKERS: The Rooftop at Selfridge's holds a special meal, giving customers the chance to meet the makers whose products feature in the famous windows. With foraged herbs from Miles Irving (Forager), eggs from Reg Johnson (Johnson and Swarbrick) and Guanciale from Peter Hannan (the Meat Merchant). £65, prebook, 6pm
MUSEUM BY CANDLELIGHT: Sir John Soane's Museum has its monthly evening opening, a chance to explore the house by candlelight. Get there early to avoid disappointment, as there are often queues and entry is limited. Free, just turn up, 6pm
CITY DEBATE: Can the City be socially useful? This is being debated as part of the City of London Festival, after Lord Turner, chairman of the Financial Services Authority, accused the City of having grown too big with parts that are 'socially useless'. £8, prebook, 6pm
HULAFIT: Discover the simple joys of hula hooping and shake off some calories in this beginner-friendly class with the founder of the London Hula Hooper's Network. It's an alternative exercise class where the emphasis is on having fun. Takes place near London Bridge. £8, prebook, 6:30pm
TIE DYE WORKSHOP: Learn how to tie dye at Drink Shop Do. The people from Tie Dye High Five are running a workshop with tips and tricks to pimp your summer wardrobe, tie dye style. A white t-shirt is provided, but you are welcome to bring your own items to dye too. £15, prebook, 6.30pm
DISGUSTING SONGS: British musical comedian Jay Foreman brings his show, Disgusting Songs for Revolting Children (and other funny stories), to The Lounge at Leicester Square Theatre, with songs, stories and poems for the whole family. £7/£5, prebook, 7pm
UKELELE LESSON: Try out the ukulele at an informal taster lesson at The Goldsmith Pub in Southwark. No experience is necessary and the ukulele is provided. Plus, if you use the discount code Southwark2for1, bring a friend and you can both join in for half price. £28/£14 with discount code, prebook, 7pm
Find more London events in our Free & Cheap events listings. Want to see your event in these last-minute listings? Email us at firstname.lastname@example.org at least 48 hours before the event, and we will consider it for inclusion. Note, due to high volumes of email, we can’t always reply.
Good Cause of the Day
Children's Charity Rainbow Trust is looking for people to get involved in the Hampton Court Charity Swim later this month to raise funds. It's a 2.25 mile river swim starting at Hampton Court Palace. There is a £36 registration fee per swimmer and swimmers should raise a minimum of £150, but we reckon anyone who braves the murky waters of the Thames is worth a bit more than that. Find out more and sign up here.
London Connection Puzzle
A new puzzle begins today, courtesy of last week's winner, Charlene Concepcion. Her first clue for you is LEONARD STREET. Please wait for clue number 2 tomorrow, before emailing in, but have a think about possible connections.
From the Archive
Last year we climbed to the top of the famous spire of St Bride’s Church in the City at the start of its renovation process...so high we even stood on the weather vane. Naturally, we filmed the experience and you can watch us undertaking the gruelling climb to the top here.