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BLOOD: Today’s opportunities to donate blood are at YMCA Hall at Barbican, outside 73 Alleyn Park in Dulwich and Minster Church Hall in Croydon. See site for terms and conditions
VOTE: Remember to vote in today's council and European elections!
ELVIS TOOTH: Elvis Presley's porcelain tooth will be on display just for today at Brightside Dental in Bounds Green. The weird curiosity aims to raise awareness of oral cancer, and you can get a free screening. Free, just turn up, from 9am
PHALLUS: The Petrie Museum hosts a talk about phallic pots and unusual terracotta shapes in the ancient Egypt. The talk is led by Jennifer Grove, researcher at the Sex and History Project, University of Exeter. Free, prebook by email, 6pm
BOX PARK: Get a free drink and listen to DJ music, celebrate the opening of the new shop Victoria Shoes inside Shoreditch Box Park, on the upper floor. Free, just turn up, from 6pm
THEATRE SCREENING: See one of the most famous National Theatre's production on a screen. The Curious Incident of the Dog in the Night-time is on at Rich Mix. £13.50-£16.50, prebook, 6.30pm
PHOTOGRAPHY: Photographer Zoe Whishaw leads a professional photography masterclass at The Crypt in Borough High Street, as part of London Photo Festival. £25/£35, prebook, 7pm
INSPIRATION SEMINAR: Cons Project kicks off today, with a rich programme of workshops, talks, parties and activities for London's most creative people. Today the opening event is a seminar about print publication in the digital age. Free, prebook, 7pm
SUPPER CLUB: Californication Wine Supper Club offers a four course menu with matching wines, all from California. Expect canapés, tasty meats and a delicious dessert. £55, prebook, 7pm
CONCERT: Listen to a celebration of Italian opera with contemporary award-winning opera performers. Rome with Orpheus Sinfonia music evening takes place at St George's Church in Mayfair. £5-£25, prebook, 7.30pm
NORDIC COMEDY: For two nights only, Aces And Eights comedy club presents The Norwegians of Comedy Lars and Martin, who will be accompanied by British comedians. The event repeats tomorrow. £9+bf, prebook, 7.30pm
LIVE MUSIC: Listen to live music at the Buffalo Bar in Highbury & Islington. On stage: The Flatmates, Chorusgirl and special guests The Understudies. £6+bf, prebook, from 8pm
DANCING SHOES: Join a night of dance and fun, Drop Me Off in Harlem brings together speakeasy jazz and electro swing, in a secret London location. 1920's dress code is encouraged and you'll be told the location after booking tickets. £8, prebook, 8pm
DOC SCREENING: Lexi Cinema hosts the screening of 2012 The Invisible War, a documentary about the issue of sexual crimes within the US military. The screening is followed by a panel discussion on the theme. £7/£5, prebook, 8.45pm
Find more London events in our Free & Cheap events listings.
Good Cause of the Day
Wear your running shoes and join the Dulwich Park Fun Runs, on Saturday 31 May, fundraising for the Cystic Fibrosis Trust. Entry fees: the 5k and 10k runs cost £10 in advance or £15 on the day, while the one-mile Junior Fun Run and Buggy Push cost £5. Sign up by email, starting time is confirmed once you've registered.
London Connection Puzzle
Your clues so far have been LINCOLN'S INN FIELDS and KENNINGTON COMMON. Today's addition is MARBLE ARCH. What's the London connection? No need to email in, as we already have a winner.
From the Archive
Need an idea for your lunch break? On this day last year we tried Egyptian street food at Koshiari Street restaurant in Covent Garden. We're sure our suggestion is still worthwhile.