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BLOOD: Today’s opportunities to donate blood are at Abbey Centre, Building 3 at Paddington Central, Sainsbury’s Car Park at Dog Kennel Hill and East Wintergarden in Canary Wharf. See site for terms and conditions
SAMPLE SALE: The Rifles Club in Mayfair turns into a fashion haven today. Here you can find famous designer clothing brands on sale up to 90% off their original prices, during a whole-day sample sale organised by Designer Sales UK. £1, just turn up, noon-8pm
SECRET COURSE: City Lit’s curious courses are designed to be surprising and unexpected. Join today’s curiosity course and discover the course’s theme during the night — the clue is ‘come to the carnival’. Drinks and nibbles are provided before the course starts. £12+bf, prebook, 6pm
PHOTOGRAPHY: Brick Lane Gallery hosts a photographers from across the world, who all share a passion for capturing reality through the camera lens. Tonight a private view launches the exhibition, which lasts until Sunday 8 June. Free, just turn up, from 6pm
GHOST SIGNS: An unusual walking tour through Stoke Newington, which focuses on local fading advertisements painted on walls. See a surviving Banksy, and explore the contemporary urban streetscape in search of recent ‘ghost signs’. £12.50, prebook, 6.20pm
TOWER OF LONDON: Historian and TV presenter Dan Cruickshank leads a talk about the architectural history of the Tower of London, from the Norman period until the modern day. The talk takes place at the Tower of London, of course, and includes a drinks reception. £12, prebook, 6.30pm
DESIGNER TALK: Textile designer Petra Börner gives suggestions and guidelines on the best ways to use patterns in your home furniture. Learn about graphics, florals or abstract designs — ticket includes drinks and nibbles. £15, prebook, 6.30pm
MUSEUM LATE: The Science Museum Late this month is all about making, hacking and doing. Enjoy themed talks and workshops, music, a pub quiz and comedy. Plus the chance to explore the museum with a glass of wine. Free, just turn up, from 6.45pm
COSMOS: Go behind the scenes of the universe, explore the 20th century discoveries that shook the foundations of cosmology and particle physics. The talk takes place at the Royal Institution and is lead by Gianfranco Bertone. £12/£8, prebook, 7pm
DOC SCREENING: See 2011 multi-award winning documentary Splinters, which explores the emerging indigenous surf scene in Papua New Guinea. The screening takes place at the Riverside Studios and includes a Q+A session. £7.50, prebook, 7.30pm
MORE COMEDY: The Big Wednesday Comedy Club is at the Charterhouse Bar in Smithfield tonight. Expect a wide variety of stand-up comedians on stage. £7+bf, prebook, 8pm
TWILIGHT TOUR: Explore Strawberry Hill and Walpole’s gothic castle at dusk. On this guided tour you will learn about the history, architecture and restoration of the castle. £20, prebook, 8pm
SPOKEN WORD: Buriers, an English alternative folk band led by singer and poet James P Honey, perform at the Old Queens Head tonight. They mix folk and spoken word together, accompanied by the sound of cello and violin. £8/£6, prebook, 8pm
Find more London events in our Free & Cheap events listings.
Good Cause of the Day
On Saturday 31 May you can take part in the Race For Life initiative, which supports Cancer Research UK. You can decide whether to run on a 5k or a 10k route, meeting point is Regent’s Park from 11am. You need to register in advance: adult entry is £14.99, child entry (6-15 girls and boys under 13) is £10 and children under 6 go free. There are volunteering opportunities as well.
London Connection Puzzle
Your first clue was WARWICK AVENUE. Today’s clue is CHELSEA EMBANKMENT. What’s the London connection? EDIT: We now have a winner, so no need to email in.
From the Archive
On this day back in 2012, we published a Londonist Out Loud podcast about the Florence Nightingale Museum. Listen and hear all about the museum that celebrates one of the most famous nurses of all times.
Street Art Spotter
This week’s photo-questions all involve London street art. The following pussy picture was snapped on an appropriately named street a couple of years ago. Which street? And does anyone know if it’s still there?