EXHIBITION Friendship Before Facebook: Social Networks in a Pre-Digital Age. Discover how were friends selected, collected and put on display before the digital era. The exhibition includes a collection of pocket-sized friendship albums made between the 16th and 19th centuries, which are full of celebrity autographs, music, miniature paintings and bawdy lift-the-flap pictures. The Sir John Ritblat: Treasures Gallery, The British Library, 96 Euston Road, NW1. 01937 546 546. Call to check opening times. Running until May. Pictured is the friendship album of Moyses Walens of Cologne, Add MS 18991, 1605-1615.

SATURDAY 20

DISCOVER South Sudanese Cultural Expo. Find out about the culture and people of Africa’s newest country South Sudan. There will be local delicacies, ancient history and poetry. Arlington Conference Centre, 220 Arlington Road, NW1. Free. 11am onwards.

WALK Regent’s Park to Camden. Enjoy a free short walk delivering a variety of architecture, planned open space and historical detail that the borough has to over. An envelope collection will be taken for the Humph Trust for young jazz musicians. Meeting at Great Portland Street tube station, Fitzrovia, W1, at 11am. Visit www.eventbrite.co.uk to book a place.

WORKSHOP Japanese Origami Workshop. Learn all about the origins of origami and the significance that it has culturally worldwide. Visitors will also be given the chance to learn some basic art form folds. All necessary material is provided, but feel free to bring your own. Shumei, 50-52 Camden Square (downstairs of the London Irish Centre), NW1. £5. 1pm onwards. Visit www.eventbrite.co.uk

SUNDAY 21

POETRY An evening of readings. Poets from the floor welcome. Torriano Meeting House, 99 Torriano Avenue, NW5. Call 020 7267 2751 for further information. £5/£4. 7.30pm.

MONDAY 22

SPORT Free all-age multi-sports sessions, including football, rugby, dodgeball and rounders. Castlehaven Community Association, Castlehaven Road, NW1. 020 7485 3386. 4pm-6pm.

TUESDAY 23

BIRDS Hampstead Heath walk with Marylebone Birdwatching Society. Bring binoculars. Meet at the Parliament Hill Staff Yard, NW5 at 10am. Walk ends at Kenwood at noon. Occasional visitors welcome. Free. Call 020 7267 8434 for further details.

OUTDOORS Camden Green Gym. Learn more about the wildlife in Waterlow Park. In this session visitors will help to create and enhance the wildlife habitat in the specially focused workshop. Waterlow Park, Dartmouth Park Hill, N19. 10.30am-2pm. Visit www.eventbrite.co.uk for further details.

PHOTOGRAPHY The Hampstead Photographic Society. Offering weekly tips, expert advice and competitions. Crypt Room, St John’s Church, Church Row, NW3. £5. Visit www.hampsteadphotosoc.org.uk for details and a full programme. 8pm.

WEDNESDAY 24

CLASS Belly Dance for Beginners. All women welcome. Fun and friendly drop in class. Try out this holistic dance form to beautiful music from the Middle East. St Pancras Community Centre, 67 Plender Street, NW1. 07960 564 401. £3. 7pm-8pm.

LECTURE Does Finance Benefit Society? This talk will show that stock market trading may contribute to society even if does not lead to firms raising new capital. Museum of London, 150 London Wall, Barbican, EC2. 020 7831 0575. Free. 6pm-7pm.

SCREENING On The Basis of Sex. Drama based on the early career of Supreme Court Justice Ruth Bader Ginsburg, followed by afternoon tea. Primrose Hill Community Centre, 29 Hopkinson’s Place, NW1. 020 7586 8327. Free. 2pm.

TALK Osteoporosis: How to make bones stay stronger. The Royal Osteoporosis Society, North West London Support Group host a talk by Juliet Compston, Professor Emeritus of Bone Medicine at the University of Cambridge. The Salvation Army, 10-16 Haverstock Hill, NW3. Suggested donation £2. 1.30pm.

TALK Consciousness (with Mutilation). Author Anthony Howell launches Consciousness (with Mutilation), a non-fiction novel, which he was driven to write following an epileptic seizure. This event prompted an investigation of the meaning of continuity in individuals, families and states. Housmans Bookshop, 5 Caledonian Road, N1. 020 7837 4473. Free entry. 7pm.

THURSDAY 25

LECTURE The Meaning, Value and Sanctity of Human Life. The Rev Canon Professor Richard Burridge discusses how the advances in medical science have brought complex ethical dilemmas, particularly around the beginning of human lives (including abortion, embryo research, IVF and gene therapy) and its ending (switching off ventilators, persistent vegetative state [PVS] and assisted suicide). Barnard’s Inn Hall, Holborn, EC1. 020 7831 0575. Free. 1pm-2pm.

MUSIC Jazz in the House. Enjoy a night of top jazz with Roger Beaujolais, Jim Mullen (guitar) and Steve Watts (double bass). Lauderdale House, Waterlow Park, N6. 020 8348 8716. £12/£7. 8.30pm.

OPEN DAY Training Link. Lots of courses to help people find work, including computer classes, adult literacy and online vocational courses. 54-56 Phoenix Road, NW1. 11am-7pm.

TALK Keep fit for the Over-60s. Kilburn Older Voices Exchange Arthritis Forum. Speaker from British College of Osteopathic Medicine. Kingsgate Community Centre, 107 Kingsgate Road, NW6. 2pm-3pm.

TALK Meet the Author. Melissa Harrison talks about her new book, All Among the Barley. Owl Bookshop, 207-209 Kentish Town Road, NW5. 020 7485 7793. £5. 6.45pm.

FRIDAY 26

DANCE Ballroom and Latin dance classes. Luther Tyndale Church Hall, Leighton Crescent, NW5. 020 7821 0874/020 8452 1853. Weekly. Improvers 6pm-7pm. Beginners 7.15pm-8.15pm.

TALK Xu Bing in Conversation. Acclaimed artist Xu Bing, who uses many forms, from installations to woodcut prints; from calligraphy to video, and is especially well known for employing written forms and symbols in his work, gives a rare interview to Philip Dodd, chairman of the creative industries company Made in China. Knowledge Centre, The British Library, 96 Euston Road, NW1. 01937 546 546. £15/£10. 7pm-8.30pm.

ONGOING

EXHIBITION Pop Art. The Go Go boots and beehive hairdos of the 60s hit Hampstead. A group of 10 artists directly influenced by the Pop Art movement share their works. Catto Gallery, 100 Heath Street, NW3. 020 7435 6660. Mon-Sat 10am-6pm, Sun 12.30pm-6pm. Until April 29.