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GIVE BLOOD: Today’s opportunity to donate blood is at St Olave Parish Hall on Fenchurch Street. Free, just turn up, see site for times and conditions
PHOTOGRAPHY: The four shortlisted artists for the Deutsche Börse Photography Prize 2013 showcase their work from today at The Photographers’ Gallery. Free, just turn up, until 30 June
FREE FILM: The Herne Hill Free Film Festival starts today with local venues taking part in screening free films across the next six weeks. Tonight, two law-and-order-themed silent films kickstart the festival. Free, see site for listings, until 1 June.
AART: Ffound is a new exhibition at the Woolff Gallery, which features work by 10 artists, all of whom are working in found and recycled materials. Free, just turn up, until 25 May
IMMERSIVE THEATRE: The truly brilliant Ockham’s Razor returns to artsdepot this weekend with Not Until We Are Lost — a fully immersive promenade production, where the aerial theatre company allow the audience to the view the action in completely unique ways. £16/£10, prebook, until 21 April
EGYPT AND IRON: How did meteorites influence ancient Egyptian culture? Find out at this lecture led by Diane Johnson at The Royal Society. Free, just turn up, 1pm
LONDON BOOKS: See Travis Elborough on how old London Bridge ended up in Arizona, and Andrew Martin talking about the tube, at Wanstead Library. £5, prebook, 7pm
STORYTELLING: Get seduced by storytelling, as Word Factory 9 has Sam Lee, Katy Evans-Bush, Vanessa Gebbie and Tom Lee at Sutton House in Hackney. £10, prebook, 7pm
LATIN HIP HOP: Booty shake in your weekend at La Raza: London Latin Hip Hop Festival at Rich Mix tonight. £13/£10, prebook for cheaper tickets, 8pm
ROLLER SKATE: The Friday Night skate starts at Wellington Arch. Anyone who feels competent on skates is welcome to join. Free, just turn up, 8pm
COMEDY: The host of very popular new material night, Old Rope, Tiffany Stevenson brings her own show Uncomfortably Numb to the Soho Theatre. £12.50/£10, prebook, 9.15pm
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Random London Fact of the Day
“TimeOut London” is an anagram of “Untold Emotion”. Whether that describes a typical day in their editorial office, we couldn’t possibly comment.
Good Cause of the Day
Wheels for Wellbeing is a great London charity that helps people with disabilities to get cycling. Even those who would find it difficult to cycle on roads can have a go, through regular off-road cycling sessions at venues like Croydon Sports Arena and Herne Hill Velodrome. They’ve got plenty of specially adapted bikes to cater for everyone. Check them out here, and consider making a donation. At the very least, give them a follow on Twitter @WfWnews. You can also vote for them in this Facebook charity poll, with the winning charity getting £150 of Zipcar vouchers to help with transport costs.
Today, we’re eschewing the Met Office’s unreliable predictions in favour of this depiction by Megan, aged 6 (as sent in by her uncle Matt Cooper). Megan forecasts a sunny day with clouds, rabbit and a superbly inked tree. Thanks Megan!