GIVE BLOOD: (Ahem, not connected with the film picture above.) If you're down Victoria way, you can donate blood at Cathedral Hall. Free, just turn up, 9.45am-12.30pm and 2-4.15pm
FASHION: The Designer Jumble Sale opens as London Fashion Week closes, with designer bargains galore — up to 90% off designer clothes and accessories, some new, some secondhand, helping to raise money for London-based charity JustForKids Law. Takes place at the Church of the Annunciation, Marble Arch. Free, just turn up, 10am-8pm
PHYSICS: Gavin Davies explains the Standard Model of how the Universe is built, but also ponders what might be missing, given that we still haven’t sussed out the nature of dark matter and dark energy. He’s speaking at Imperial College and all are welcome. Free, prebook, 5.30pm
FILM: The Underground Picturehouse returns to the basement of Shoreditch's The Water Poet, with a screening of From Dusk Till Dawn. We hear there'll be free beer from Meantime Brewery, too. £6, prebook, 6.30pm
SURGERY: Training up a new surgeon isn’t like training up a new hairdresser. One slip of the scissors and you’ve killed someone. So how’s it done safely? An event at the Dana Centre in South Kensington takes the audience through a trainee colon operation, with real footage from the theatre. Free, prebook, 7pm
FILM: Talkies Community Cinema screen The Blues Brothers at the Fox Pub, Palmers Green. Live music comes courtesy of the Vintage Blues Club before and after the film. £5, prebook or take your chances, 7pm
EVOLUTION: Esteemed palaeoanthropologist Chris Stringer discusses recent discoveries about the origins of the human species in an open-to-all Imperial lecture. £10, prebook, 7pm
COMEDY: The Awkward Silence host another of their incredibly long and incredibly good sketch nights at the Wilmington Arms, with guests Pajama Men, Sheeps, Jacob Edwards and Ben Target. £7, just turn up, 8pm
Random London Fact of the Day
Clerkenwell Fire Station is said to be the oldest working fire station in Europe, in operation since 1872 and based in a Grade II listed building on Rosebery Avenue. Here's an excellent photo-tour from Spitalfields Life (playing away from home). Alas, it's one of many stations facing possible closure in the current round of funding cuts. A campaign is under way to save the historic station. If you'd like to learn more, follow @SaveClerkenwell on Twitter, and let's see if we can get them up to 1,000 followers by the end of the day.
Good Cause of the Day
Let's stick with fire-fighting. This year's Tunnel 2 Towers charity run, in memory of those rescuers who died during the 9/11 attacks, recently opened for registration. Full details have yet to be released but, if the same as last year, it will start in Southwark Park, dip under the Thames via the Rotherhithe Tunnel and finish in the shadow of the Canary Wharf towers. 5km in total. Funds raised go to emergency service charities such as The Fire Fighters Charity. It takes place on 21 July, and there's a 10% discount on early bird sign-ups. Register here.
Today's forecast should be sang to the tune of Mambo No. 5. Yes it should.
A little bit of raincloud in the morn,
A little bit of drizzle down from the dawn,
A little bit of bluster, easterly,
A little bit of weather's all I see.
A little bit of lunchtime winter sun,
A little bit of blue-skied sandwich fun,
A little bit of cloud once more at night
A little bit of cold, but that's alright
Bah-bah-ba-bah! (dum-de-dum-dum) Bah-bah-ba-bah! (dum-de-dum-dum)
Mambo Number 5!
BBC Weather presents the forecast with a less obvious brass section.