Things To Do In London Today: Tuesday 16 April 2013

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GIVE BLOOD: Today’s opportunities to donate blood are at Brewers Hall in the City of London and Conway Hall in Holborn. Free, just turn up, see site for times and conditions

SPELT: From today Great British Spelt Recipes, a collaboration between Sharpham Park and Bowel Cancer UK, will pop up on the first floor at Fortnum and Mason. High profile chefs will demonstrate their delicious spelt recipes in a series of events and talks, with all proceeds going to Bowel Cancer UK. £20 to each event, prebook, until 28 April

33%: Ovalhouse’s 33% London Festival celebrates young artists, directors, producers and apprentices making their way in the performance industry. There will be theatre, art and writing masterclasses. See website for full listings, until 27 April

LIGHT: One Beam of Light exhibition opens today at the Institute of Contemporary Arts. This showcase is the result of a global photographic project to capture 'inspirational images that start with a single source of light'. Free, just turn up, until 20 April

SALAD: This week is National Gardening Week. For the green-fingered among you, today there is a salad growing masterclass at King Henrys Walk Garden. £5, prebook, 7pm-9pm

LONDON POEMS: We love London. Head to Mayfair Library to discuss London in poems. Free, prebook, 6pm

FILM: The Barbican screens the Academy Award-nomiated The Gatekeepers tonight, a documentary film featuring intimate interviews with six former heads of Israel's secret service agency. It will be followed by a ScreenTalk with journalists Dimi Reider and Daphna Baram. £11.50/£10.50, prebook for cheaper tickets, 6.30pm

FIND ALAN: Alan has gone missing. And most importantly, he has your beer tokens! Use your mobile phone to join this manhunt and you will receive a series of clues from Alan on his whereabouts. The first six people to track him down win the precious beer tokens. £5, prebook, 6.30pm

YOUNG NOVELLISTS: Granta celebrates the new list of Best of Young British Novelists at Waterstones Piccadilly. £8/£5, prebook, 7pm

SPOKEN NERD: Geeky trio Festival of the Spoken Nerd return with a three-night show at Bloomsbury Theatre, with a stand-up and musical show devoted to technology. Whether you’re a Mac, a PC, or just a human being, don’t miss another sellout night of science and silliness. £14, prebook, 7.30pm

IMPROV: See two improvised shows with Hoopla Improv at The Miller in London Bridge. First up, there’s 1920s-style period costume drama Upstairs Downton, then a comedy musical from Music Box. £5/£2.50, just turn up, 8pm

%@$!: Viz co-founder Simon Donald sets up a School of Swearing at the Comedy Cafe in Shoreditch, examining the four corners of the four letter word. £5, book ahead or just turn up, 8pm

COMEDY: Ellie Taylor, Funmbi Omotayo, Ivo Graham, The Intimate Strangers, Hill and Weedon and Same Golin make the line-up of The Secret Variety Club, a bargain comedy night. £3, just turn up, 8.30pm

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Random London Teaser of the Day
It's possible to travel through 10 Tube stations in a row, all beginning with the same letter. Where and how?

Good Cause of the Day
Joe Derrett, a runner from North London, aims to complete a world first this weekend — running the 26.2 mile London Marathon on Sunday 21 April, and then running the same route in reverse the next day. As if he won't be knackered enough, he will also be live tweeting his runs using the hashtag #2marathons2days.

Joe is running for the London Community Foundation charity who fund projects via the Lambeth Giving Fund to help young Londoners, people with mental ill health and older people in Lambeth. You can support him online or donate via his fundraising page.

London Weather
Spring continues its Marge Simpson 'slow and steady wins the race' attitude. Moderate, unremarkable temperatures and a botheration of clouds are a marked improvement on last week, but it's all still disappointing sky bilge. The wind can cock off as well.