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BLOOD: Today’s opportunities to donate blood are at The Hop Exchange in Southwark Street, Cathedral Hall in Victoria and Baitul Ahad Mosque in Upton Park. See site for terms and conditions
TRANSYLVANIA FESTIVAL: The Romanian Cultural Institute in Belgrave Square has a three-day festival celebrating all things Romanian. Various prices, prebook, until 15 May
WHITECHAPEL WALK: The London Jewish Cultural Centre hosts a guided walk around Whitechapel and Stepney, taking in the Jewish history of the area. £14, prebook, 10.30am
DISCOVERY GAME: Join this discovery game of the City of London, unveil forgotten tales from those who lived and died there. Team up with your friends and bring a map, get the clues and start the game — meeting point is at Smiths of Smithfield. £20 (per team — cheap if you’re four people or more), prebook, from 11am
MILITARY DISPLAYS: Finsbury Barracks, home of the Honourable Artillery Company, has an open evening, giving the public a chance to meet military personnel, climb aboard a chinook, and see displays by selected regiments. Look out for the parachute drop. Free, just turn up, 5pm-8pm
WALKING THE UNDERGROUND: Head to Guildhall Library for a talk by Mark Mason, author of Walk the Lines, about his experiences of walking the London Underground, overground, and some trivia he learnt along the way. £5, prebook, 6pm
OPULENT HOTELS: Trails of the City runs a walk, Not Just Tea At The Ritz, on which you'll learn the stories behind the glamorous hotels of Mayfair. £8, just turn up, 6pm
PING PONG: The Book Club in Leonard Street has a small ping pong arena on its ground floor. Today’s competition includes drinking vouchers for the winners. £5, just turn up, 6.30pm-11pm
ADULT STORYTELLING: Crick Crack Club, the adult storytelling night at The Forge in Camden, has a theme of Eros & Psyche tonight, explored by performance storyteller Sally Pomme Clayton. £10/£8, prebook, 7.30pm
SWING: Hippodrome Casino hosts a Swing Revival. Learn swing dance, then kick back and listen to live swing and jazz music. £8-£15, prebook, 8pm
KRONOS QUARTET: The Kronos Quartet performs a 40th anniversary celebration concert at Barbican, featuring new music by Philip Glass, Bryce Dessner, Jarvis Cocker and more. £20-£35, prebook, 8pm
Find more London events in our Free & Cheap events listings.
Good Cause of the Day
The Red Shoe Walk in aid of British Red Cross takes place this Saturday, and there's still time to register to take part. Choose from a four or eight mile walk through the city, dressed in red (red shoe covers are provided), get sponsored and raise money for the British Red Cross. Registration is just £10, and can be done here.
London Connection Puzzle
A new puzzle starts today, courtesy of last week's winner Sarah Esposito. Your first clue is PUTNEY HEATH. Don't email in just yet, but have a think about possible themes ahead of the second clue tomorrow.
From the Archive
In 2011, we shared our list of the Top 10 Things To Do In The Borough of Southwark. Sadly, it's more use for posterity than planning today — the Cuming Museum caught fire last year and has been closed since, Elephant & Castle Shopping Centre is earmarked for redevelopment, and as one astute reader commented, the Alfred Salter statue had been stolen. Still, it was nice while it lasted.
Have You Clocked This Clock?
This week's picture puzzles all concern London's timepieces. This handsome example dates from 1682. Where in London, exactly, can you find it. And what does the chap on top represent?