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BLOOD: Today’s opportunities to donate blood are at London Marriott Hotel in Canary Wharf, HSBC Sports and Leisure Club in Beckenham, outside Wells House in Bromley and St James Church Hall in New Malden. See site for terms and conditions
TRASH ART: A new group exhibition at Rich Mix opens today. Trash looks at discarded and thrown away objects, and the impact they have on our society. Free, just turn up, until 18 May
LONDON WONDERGROUND: The festival returns to Southbank for the third summer from today, with circus and cabaret acts, sideshows and more. Prebook, until 28 September
BEER TASTING: The Hack & Hop on Whitefriars Street hosts the fifth birthday celebrations of Ilkley Brewery, which has just produced its 1000th brew, a darjeeling & blackberry infused brown ale. Free tasters of the beer will be on offer. Free, just turn up, 6pm
JOURNALISM WORKSHOP: Leaderise London holds a free journalism workshop at Savoy Tup bar on The Strand, with journalist Danielle Batist sharing her experiences, followed by a Q&A session. Free, prebook, 6.30pm
LONDON HISTORY: The monthly social for London Historians takes place upstairs in the Windsor Castle, Victoria. It's simply a mingle, with some beer, but is a great way to meet others interested in London's history. Free, just turn up, 6.30pm till late
TECHNOLOGY DEBATE: See a debate about trust and new technology at The Free Word Centre on Farringdon Road. Panelists discuss views on state surveillance, privacy, and the choices we make about sharing our personal data online. Free, prebook, 6.45pm
LIFE DRAWING: A drop-in life drawing class takes place at The Library Space in Battersea, open to people of all levels and abilities. £11, prebook, 7pm
FOODIE POP-UP: The Dressing Room aims to prove that salads aren't just for the health conscious. At this pop-up, diners are given DIY dressings to complete the dish themselves. Cash only for extra drinks purchased. £35/£40, prebook, 7pm
ALAN BENNETT: The well-known playwright discusses his works with Nicholas Hytner at a platform at the National Theatre. £4/£3, prebook, 7pm
CELEBRITY SHOW: Mike McCartney's (brother of Paul McCartney) show at the Ambassadors Theatre tells stories of Liverpool life, surviving Beatlemania and includes several celebrity anecdotes. £12.50/£20, prebook, 7.30pm
Find more London events in our Free & Cheap events listings.
Good Cause of the Day
The Tricycle in Kilburn hosts a double film screening tonight, with two films that challenge perceptions of old age. Fabulous Fashionistas explores how to live life to the full, and is followed by a Q&A with director Sue Bourne. Ping Pong looks at how different people face the ageing process. Tickets are £15 and can be booked here. All proceeds go to Independent Age, which offers support to elderly people.
London Connection Puzzle
Your first clue was BRIDE LANE. Your next is PARKGATE ROAD. What's the London connection? EDIT: we have a winner, so no need to email in.
From the Archive
The long weekend may be a distant memory, but if you're already looking forward to this weekend, why not walk the Thames Path? At 180 miles long, we'll forgive you for not walking the whole trail in one go, but we're particularly fond of the Richmond and Putney sections.
Name That Statue!
A fairly easy one today. Where can you find this forlorn-looking dog? Who is his master? And what's the dog's name?