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BLOOD: Today’s opportunities to donate blood are at YMCA Hall inside Barbican, O2 Centre in Swiss Cottage, Charing Cross Hospital and the usual donor centres. See site for terms and conditions.
URBAN FOOD: Celebrate local food producers across the capital with Urban Food Fortnight, in association with Capital Growth. See our suggestions for the best things to do during the food celebration. Until 28 September
LONDON DESIGN FESTIVAL: London’s celebration of design in all its forms is happening all over the capital. There are plenty of events to choose from, most are free: we’ve selected the top things to do during the festival. You can also browse one of these design-themed exhibitions connected to the festival. Until 21 September
CITY HUNT: Join a free treasure hunt and discover the secrets of the Blackfriars area. Play the game in teams or on your own, suitable for all ages and abilities. You can play via the website or pick up a printed map from one of two start points: full information on how to participate is on the website. Free, daily 10am-4pm until 21 September
ART EXHIBITION: New Lights launches today at Mall Galleries. This is a touring charity exhibition that supports artists from the north of England. On display: both established and emerging artists. Free, until 20 September
CYCLE TOUR: Discover Richmond with a riverside cycle tour departing from Richmond station, celebrating the Totally Thames festival. Cycle past Richmond Green and Old Palace Yard, cross the Thames at Teddington Lock and return to Richmond, passing historic Ham House. £35-£15, prebook, 10.30am
EXHIBITION TOUR: Lisa Squirrel leads an audio descriptive tour of Tate Britain's current Turner exhibition. The tour is free but you need to book your ticket for the exhibition. £15, just turn up, 11am-12.30pm
LAYDEEZ DO COMICS: The female-led graphic novel forum is at Foyles Charing Cross Road, providing somewhere for graphic novel artists (male and female) to test out new ideas. Free (donations for cake welcome), prebook, 6pm
ARTIST TALK: Curator Chus Martínez talks to artist Andrea Büttner about her current display at Tate Britain, exploring Büttner’s interest in notions of poverty, shame, vulnerability and dignity, and the belief systems that underpin them. £9, prebook, 6.30pm
PIMP MY PET: The Book Club in Shoreditch hosts a craft workshop dedicated to cats. If you'd like to make your kitty prettier, during this evening you'll learn how to create nice toys for your pet and make its collar shine. £8+bf, prebook, 7pm
LITERARY DINNER: Hardy's Brasserie in Marylebone hosts a literary dinner with author Tracy Borman, who presents her new book about Thomas Cromwell. The dinner will be in Tudor feast style and the author will give a talk while you eat. £35, prebook by email, 7pm
COMEDY: Head to The Star of Kings in King's Cross for an alternative night of comedy with The Spectacular Spectrum of Now. £5/£3, just turn up, 7.30pm
RESPONSE NIGHT: The Me Plays production at the Old Red Lion Theatre has invited playwrights who saw the show to create a 10-to-15-minute response. Get your ticket and join the show discussion. £12/£10, prebook, 7.30pm
Find more London events in our Free & Cheap events listings. Want to see your event in these last-minute listings? Email us at email@example.com 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
LOL — Laughter Over Literature is a comedy gig on tonight at the members club Library in Covent Garden tomorrow, Tuesday 16 September. The event aims to fundraise to build a library in Kenya, helping Educating The Children (ETC). Acts confirmed are Ava Vidal and Imran Yusuf. £25+bf, prebook, 7pm
From the Archive
On this day last year, we shared this picture of flooded benches by the river, taken by Dave Pearce on Flickr.