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BLOOD: Today's opportunity to donate blood is at the Ecology Pavilion in Mile End. See site for terms and conditions. Free, just turn up, 1-3pm and 4.30-7.30pm
SWEDISH SOUTHBANK: Don't miss the second day of the Umeå exhibition about the northern Swedish town that's next year's capital of culture, held in a ice lodge-inspired hub on the Southbank. Free, just turn up
CERAMICS IN THE CITY: The Geffrye Museum's annual celebration of ceramics returns today, Saturday and Sunday, featuring around 50 ceramicists from across the UK. Prices start from £10 for small objects, rising to several hundred pounds for large-scale work. Free, just turn up, 10am-5pm
UCL SHOW 'N' TELL: Today's Grant Museum Show 'n' Tell speaker is Ben Garrod, a PhD student at UCL with a long-held passion for all things "bone", today's subject. Free, just turn up, 1pm
HOLOCAUST LETTERS: Robbie Friedmann discusses his new book 28 Letters: The Short Life Of Renée (Baba) Friedmann On Not So Calm Waters at the Wiener Library; the letters were written by the author's mother to her sister. The book explores how people lived through the Holocaust. Free, booking essential, 1pm
ICA CULTURE NOW: See Alice Rawsthorn, design critic of the International Herald Tribune, in conversation with Gregor Muir at the ICA. Her latest book Hello World: Where Design Meets Life explores the impact of design on our lives: past, present and future. £5 / Free to ICA members, book here, 1pm
WALK WESTMINSTER: Guide Sean Patterson once again takes you along the same Whitechapel route as Charles Booth took in the 19th century, bringing the past to life with readings from the handwritten Edwardian report. £10/£8, prebook, 3pm
CHOCOLATE TASTING: Head to Scoop at 40 Shorts Gardens tonight, where they've sourced Grand Cru single origin cocoa to offer you the best tasting chocolate from each producing country: Ghana, Venezuela and Sao Tome. Find out more here
POSTER PLAYGROUND: If you haven't seen London Transport Museum's excellent Poster Art exhibition yet, why not head there after work today where the popular posters will be enhanced with wandering magicians, a scavenger hunt, fortune telling, balloon sculpting, face painting and 2-for-1 cocktails. Book ahead, £8/£6, over 18s only, 6.45-10pm
HORNIMAN FASHION SHOW: Fashion Late at the Horniman Museum is part of Forest Hill Fashion Week: head to the Horniman to see live catwalk shows, a fashion market, makeovers, masterclasses, talks, stilt-walkers, music, cocktails, bars and food. Pre-book or just show up, £3, 6-9pm
REGULAR MUSEUM LATES: Unwind after work with a spot of culture at the British Museum, National Gallery, Tate Modern, Royal Academy or National Portrait Gallery. Free, check websites for closing times and events
ROLLER SKATE: The Friday Night skate starts at Wellington Arch. Anyone who feels competent on skates is welcome to join. Free, just turn up, 8pm
Good Cause of the Day
We're in the middle of the Give More Challenge week, in which people are encouraged to give a little bit more time, money or energy to a charity of their choice. In a nice visual twist, every pledge turns into a pin on this map. The idea is to totally fill the map with pins by 22 September. Think about the causes close to your heart, make a pledge, then fulfil your pledge.
From the Archive
Did you know it's a year since the Walkie Talkie (now dubbed the Walkie Scorchie following revelations about its sun-focussing abilities) reached its full height? We took a tour of the building, including the impressive views from the top.
London Connection Puzzle
Your keywords so far have been CROUCH END, MUSEUM, VAUXHALL CROSS, and today's — HOBBS END. Spotted the London connection? Many have already written in with the correct answer, so just keep it to yourself and adopt a smug face. Solution on Monday.
London Weather by Inclement Attlee
Remember Shania Twain? We were once romantically linked. In fact, her potent 1998 crossover hit That Don't Impress Me Much had a hidden verse dedicated to the inadequate advances of yours truly:
OK, so you're a weather forecaster?
That don't impress me much.
So, you got the rain but have you got the touch?
Don't get me wrong, yeah, I think you're alright
But you predicted sun for the middle of the night!
It's true. I did. I was a very poor weather forecaster in those days. Perhaps now that I'm a professional meteorologist, Shania will be impressed. Especially if I tell her that her name is an anagram of "I wanna-a shit". She'll love that.
What's that? Oh, the weather? Yes, it's going to be a massively dry day, with frequent gannets of sun and occasional puffins of wind.