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LONDON IN PRINT: Head to Gallery@Oxo today for an exhibition of iconic London prints courtesy of Paul Catherall. Free, just turn up, until 19 May
RE:THINK: A small festival mixing community interest activities with ethical approaches to business and creativity arrives in London today. There is a great variety of screenings, talks and workshops, check out Re:THINK Festival's website for full listings. Free, prebook, until 3 May
MAY DAY: It's 1 May Day today, and to celebrate Fowler's Troop and the Deptford Jack in the Green (a traditional, foliage-covered participant of May Day parades) will be visiting Deptford and Greenwich. Take a look at the route here. Free, just turn up, from noon
(BRIAN) MAY (THE BADGER) DAY: If you fancy seeing Brian May dressed as a badger (and let's face it, who doesn't?) then head down to the Department for Environment, Food and Rural Affairs in Victoria at midday to see him lead a flashmob, protesting the Conservative-led badger cull. Free, just turn up, noon
TRANSPORT: Most people who moan about London’s transport networks don’t have viable solutions to their quibbles. This chap reckons he does. Douglas McWilliams talks at the Museum of London in a Gresham lecture that will reveal how transport could be cheaper and more efficient. Free, just turn up, 6pm
WHODUNNIT: Crime writers Arne Dahl, Antti Tuomainen and Stuart Neville are in conversation at Waterstones Piccadilly. £5/£3, prebook, 6.30pm
PUTTING SCIENCE BACK INTO SCIENCE FICTION: What are the current breakthroughs and technologies that will inspire the next generation of science fiction? A splendid selection of panelists discuss the links between science and fiction at the Royal Society tonight. Free, just turn up, 6.30pm
LONDON HISTORY CHINWAG: London Historians' monthly informal meetup takes place, as ever, upstairs at the Windsor Castle, Victoria. It's open to anyone with a passion for the city's history, and you'll find Londonist editor Matt, in the corner spouting random trivia at anyone who'll listen. Free, just turn up, 6.30-11.00
TWEET OUT LOUD: Remember the days when people used to talk rather than tweet? Join Tweet Out Loud tonight and take it back to basics as attendees can deliver their one-liners, Haikus, slogans or thoughts on stage. The catch? You only have 20 seconds. £1, just turn up, 7pm
FILM: A One Eyed Man in the Kingdom of the Blind is an independent film about a Soho-based detective who is hired to find a mysterious one eyed man. It is by London-based artist Robert Rubbish and shows tonight at Rough Trade East. Free, just turn up, 7pm
MONSTERS: Lloyd Shepherd, Amanda Craig, Suzi Feay, Emran Mian and Meike Ziervogel are reading about Monsters at the Working Men’s College Library in Camden. Free, prebook, 7pm
COMEDY: Omid Djalili starts a four week residency at Leicester Square Theatre tonight, at time of writing there are still tickets left. £25, prebook, 7.30pm
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Random London Fact of the Day
Had you been standing in Hyde Park 162 years ago today, you might have seen Queen Victoria opening the Great Exhibition in the Crystal Palace. Of course, the palace shifted to south London after the exhibition where, among other things, it housed the world's first museum dedicated to motor vehicles. Coincidentally, Crystal Palace Park was also the location of the UK's first fatal accident in which a car hit a pedestrian. Bridget Driscoll was killed in August 1896, when she was hit by a vehicle travelling at just 4mph. The coroner at the time said that he "hoped hers would be the last death in this sort of accident". Around 100 pedestrians per year are now killed in collisions in the capital.
Good Cause of the Day
Bloomsbury Theatre hosts a comedy fundraiser tonight, to raise money for Firebox, a radical cafe in King's Cross. Stewart Lee, Francesca Martinez and Mark Thomas are on the line-up. £25/£20, prebook, 7.30pm
Continuing our theme of culinary weather forecasts, today's outlook is brought to you courtesy of Iceland's Alphabet potato shapes (other tuber-based lexicons are available).
In summary: exactly the kind of sweltering day on which you don't want to have a whole bag of warm potato product to munch through.
Feel free to send in your own edible forecast for consideration.