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BLOOD: Today’s opportunity to donate blood is at Brewers Hall in the City of London. Free, see site for terms and conditions.
SUMMER SCREEN: The Film4 Summer Screen at Somerset House starts today. All event are sold out apart from one: Throne of Blood on Thursday 15 August. If you fancy it, we suggest you book quickly before that sells out too. £14.50, prebook
OPERATING LONDON: Visit the Old Operating Theatre for a family workshop discovering the difficulties surrounding St Thomas’ hospital admission in the 19th century. Free, just turn up, 2pm
EDIT-A-THON: Join Conway Hall and Wikimedia UK for an online Edit-a-thon to improve the coverage of subjects related to the atheist and humanist movement on Wikipedia. Volunteers, staff and archivists will all take part. Free, just turn up, 5.30pm
EAST LONDON: Abadesi Osunsade, co-editor at Cloak & Swagger, has filmed a series on the best places to go in East London called East With Love. Head to a screening of film and accompanying live music at Genesis Cinema. Free, just turn up, from 7pm
FILM & TV: Know your Dot Cottons from your Doris Days? Then head to the Roxy Film & TV Quiz at Roxy Bar & Screen on Borough High Street and show the other teams what you're made of. £2.50, prebook, 7.30pm
COMEDY: Holly Walsh, Prince Abdi and Josh Howie comprise a pretty hot line-up tonight for the 99 Club, off Leicester Square. £9, prebook, 7.30pm
NAMING MONSTERS: Author Hannah Eaton investigates the psychological function of creepy tales and how they are used to as a way to dwell upon otherwise unspeakable feelings. At The Old King’s Head in Borough. £2.50/£1.50, just turn up, 8pm
TIME: Roundhouse's Timepiece installation is the centre of a Live Late evening with performances by emerging artists exploring spoken word, experimental voices and electronica. Pay what you like, just turn up, 8pm
GIG: Indie rockers and local London band The Deets (who we tipped as being ones to watch recently) form part of the line-up at Bar Music Hall in Shoreditch this evening. Free, just turn up, music from 8pm
OUTDOOR CINEMA: Another outdoor film screening, this time courtesy of Backyard Cinema. Die Hard in Camden Market, anyone? £10, prebook, 9pm
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Good Cause of the Day
Dawn O’Porter kicks off Pink Fridays for Breast Cancer Care by hosting the Best Friends Ball charity event on Friday 20 September. She will be joined by Sophie Ellis Bextor, DJ Gemma Cairney, Mel C and a whole host of comedians and performers at Bush Hall to launch Breast Cancer Care’s Pink Fridays campaign and raise money for the charity. £38, prebook, Friday 20 September at 8pm
London Connection Puzzle
Tuesday's clue was BELL. Wednesday's was SALT. Today we give you the clue-word CONSTABLE. What’s the London connection? Several other people have already got it, so no need to email in. Final clue tomorrow.
From Londonist’s Archive
Just over three years ago we visited London's 'vanished' river, the Fleet, and brought back photos so you can see it too.
Inclement Attlee is taking a week’s holiday so we return to our Japanese replacement, Met Office-san, for a haiku forecast.
Gentle summer sun
Brightens the day like a rose.
Cornetto for lunch.