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Things to do today:
ALTERED LANDSCAPES: Watermans hosts a multimedia installation tackling the themes of trauma, displacement, personal narratives and landscapes. Through video, light and sound, Altered Landscapes takes you on a journey through the experiences of refugees. Free, just turn up, 10am-11pm
GUN SALUTE: She doesn't just have a cake and a couple of candles — HM The Queen gets her very own 41-round gun salute for her 90th birthday today. Head to the Parade Ground in Hyde Park to see (and definitely hear) the celebrations. Free, just turn up, 12pm
LUNCH: 20 food stalls, flavours from across the world — all set against the backdrop of the historic buildings surrounding Guildhall Yard. This lunch market is a perfect excuse to get out of the office and take a break outside with some delicious dishes. Free (food and drink costs vary), just turn up, 12pm-2.30pm
TWILIGHT TOURS: Poke around the past at 18 Stafford Terrace — former home of Punch cartoonist, Edward Linley Sambourne. It's a treasure trove of Victorian decor, artwork, furniture and ornaments. Join one of two special Twilight Tours, with complimentary drinks before. £13.85, prebook, 6pm/7.30pm
SAMURI LECTURE: Discover the history of the Japanese art of samurai at Asia House. Exploring how guns and swords captured the imagination of early Japan, Dr Doreen Mueller, discusses how the use of weapons impacted on the already-established culture of samurai masculinity. £9.35, prebook, 6.30pm
FLASHBACK QUIZ: Compete to win a Bagpuss at tonight's Children's TV Nostalgia Quiz at the Museum Of Childhood. Hosted by London's best quizmaster, Matt Brown, with a soundtrack from Jonny Trunk Records, it's time to test your Teenage Mutant Hero knowledge, your Fun House facts and your Watch With Mother wisdom. £10, prebook, 7pm
PAINTING: Leighton House Museum invites you to discover The Day Dream Of Painting at this evening lecture focusing on their current exhibition, The Pre-Raphaelites On Paper. Art historian, Christopher Newell, explores the purposes of these beautiful works. £15, prebook, 7pm
SOME VOICES: Choirs don't come more exciting than Some Voices. With talent in truck loads and a skill for choosing to cover the unexpected hits, join a musical trip Across The Universe at Electric, Brixton. £16 (+bkg fee), prebook, 7.30pm
COMEDY: "All spit no polish, all show no pony" — we reckon highly-rated comedian Stuart Goldsmith is being too humble for his own good, but we'll let you work that out for yourselves as he performs at Soho Theatre for the next three nights. £12/£10, prebook, 9.30pm
Good cause of the day
Marking the three-year anniversary of the Rana Plaza factory collapse in Bangladesh, TRAID Dalston is holding a late night store opening, from 6.30pm-9pm. With money from all of the night's sales going to support garment workers in Bangladesh, fill your basket with pre-loved fashion and soak up the sounds from DJ Baldbeast while you shop. 6.30pm-9pm, 21 April