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BLOOD: Today’s opportunities to donate blood are at the ASDA on Old Kent Road, and Bishopsgate Institute. Free, see site for terms and conditions
GIANT BLUE COCK: A controversial blue cockerel (’Hahn/Cock’ by Katharina Fritsch) will appear on the fourth plinth of Trafalgar Square from today. Free, just turn up, in place for a year
3-D: Summer has come to the Science Museum in 3-D form. Visitors can take part in 3-D design workshops, make their own 3-D glasses, or catch a 3-D film. Free, just turn up, until 1 September
TOWER BRIDGE: Get a behind the scenes look at the inner working of Tower Bridge this summer, with a series of Techie Talks. Free with price of admission to Tower Bridge Exhibition (£8), just turn up, until 29 August
SUMMER NIGHT MARKET: Summer Night Markets at Camden Lock Market take place every Thursday for six weeks starting tonight, with film, music, street food, ping-pong and cocktails all on offer. Free, just turn up, until 29 August
90S FILM FEST: 90s classic and cult films screen outdoors at the Portobello Pop-up Cinema in London, for We Love The 90s Film Fest. Showing tonight is Poetic Justice. £5, prebook, until 28 July
ARTISTIC STREAK: It's All About Art returns to London for three days of exhibits, art workshops and demonstrations at Islington's Business Design Centre, with the aim of inspiring people to develop their artistic streak. £12, prebook, until 27 July
ZERO: Zero Film Festival, the only festival dedicated exclusively to self-financed filmmakers, rolls into Netil House today for two evenings of authentically independent films. £6+bf, prebook, until 26 July
ETON MESS: How do you like your Eton Mess in the morning? If the answer is RIDICULOUSLY OVERSIZED then there is a world record attempt to make the largest Eton Mess in Soho Square this morning. Free, just turn up, 8.30am
COMIC TALES: With over 30 years as a record company sales rep, few people have visited as many of the nation's record shops as Graham Jones. Join him at Charing Cross Foyles as he shares the treasure trove of stories he accumulated during his decades on the road. Free, prebook, 6.30pm
LOLS: You can see Daniel Simonsen properly preview his new Edinburgh show alongside Marcus Brigstocke and Gareth Richards with this Always Be triple bill at The Tommyfield in Kennington. £7+bf, prebook, 6.55pm
IMAGINATIVE SCIENCE: Join The Last Tuesday Society for a lecture on the idea that creative imagination played a crucial role in the development of science during the scientific revolution. £7, prebook, 7pm
FIESTA: Art, music, stories, theatre, singalongs, games, hoola hoopers, and more at Open Arts Cafe's Fiesta. Free, just turn up, 7.15pm
FILM: The Mosaic Rooms presents an evening of short films about the Egyptian Revolution by director Omar Robert Hamilton and the non-profit media collective Mosireen. £5, prebook,7.30pm
PAPER: Annie Kevans, Dominic McGill and Paul Westcombe discuss the importance of working on paper within their respective practices, at Saatchi Gallery as part of the Paper exhibition. £10/£6, prebook, 7.30pm
WT STEAD: William T Stead was a towering figure in late Victorian and Edwardian England: journalist, proprietor, imperialist, a Liberal radical, feminist, dissenting Christian, and occult obsessive. Roger Luckhurst discusses this unique man at The Bell, with the London Fortean Society. £3/£2, just turn up, 8pm
IMPROV: Three short plays. In one hour. All from your suggestions. The Improsarios present The Trilogy at Arcola Theatre in Dalston. £14/£12, prebook, 8pm
BLACKFISH: Head to The Lexi Cinema for a screening of Blackfish, a film about the largest Orca in captivity, Tilikum. Despite killing three people, Tilikum remains a tourist attraction at SeaWorld and Blackfish reveals the consequences of keeping such creatures in captivity. £7/£5, prebook, 8.30pm
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Good Cause of the Day
"Walk through the old turbine hall, up the derelict staircase, onto the roof and take in the breathtaking views of the London skyline. Turning your back on the view and fixing your eyes on the huge, iconic chimneys, you’ll descend down the walls of Britain’s largest brick building.'
Friends and family can cheer you on from the ground and when back on terra firma, participants can join a post-event reception. £30 registration fee with suggested £200 sponsorship, register online, Saturday 31 August at 8.30am
London Connection Puzzle
The cluewords so far have been George and Henry. Today's addition is 'Charles James'. What's the London connection? Two people already guessed it, so no need to write in. Final clue tomorrow.
London Weather, by Inclement Attlee
A spatooke of rain, a grommage of cloud and a hesimaculum of wind spoil the morning somewhat. But the fake words will soon blow away, leaving a bright, sunny afternoon. In summary: multipottageworthy.