A good weekend for runners, crafters and curious Londoners. Acton Depot Open Weekend: Capital Design (21st-22nd) |\u00a0 \u00a312 A rare chance to peruse thousands of items in the London Transport Museum storehouse not normally open to the public.\u00a0These depot open days take place three times a year, with the next in July and then September. The focus of this open weekend is Capital Design, so you can see vintage vehicles, posters and learn about Johnston Font. There are plenty of activities for kids too. Tickets are only available in advance. The Creative Craft Show London\u00a0(21st-22nd) | Free\u00a0 A haven for craft-lovers nationwide, this three-day event has everything you could ever need for knitting, cross-stitch, paper crafting, jewellery and dressmaking as well as for stitch enthusiasts. They have stalls offering the latest innovations and tools, ideas and creations as well as more supplies than you ever thought possible. London Marathon\u00a0(22nd) | Free\u00a0 Cheer on the long-distance runners along the world-famous 26m course. Starting in Greenwich Park, and finishing at The Mall, SW1, there is always a huge crowd and an exciting atmosphere. The biggest crowds are usually gathered on Tower Bridge and Embankment, as well as at the finish line. See the official website for full route details, and spectator info. Sonica Installations\u00a0(21st-22nd) | \u00a34.50\u00a0\u00a0 The annual sound-art festival returns to King\u2019s Place including a sound installation featuring 176 snails. Other works in the programme Singularity: a shape-shifting white light moving to abstract violin and toy piano sounds by artist Solveig Settemsdal and musician Kathy Hinde; and a VR sculpture which poses questions about the past and future of technology by visual artist Heather Lander and sound artist Robert Bentall. Insight Astronomy Photographer of the Year Exhibition (21st-22nd April and ongoing) | Free Look to stars, planets, nebulae and more at The Royal Observatory in Greenwich. This free exhibition celebrates the best astrophotography taken by photographers all over planet Earth. Listen: 140 Years of Recorded Sound (21st-22nd April and until 13th May) | Free As the name suggests, this exhibition is an auditory rather than visual experience. Celebrating the origin of recorded sound, it follows a timeline from 1877 featuring key events in sound recording history, with rare and unpublished recordings as well as a specially commissioned audio installation by composer Aleks Kolkowski. he exhibition is part of the Season of Sound, celebrating the Library\u2019s sound archives. The exhibition can be found in the entrance hall of the British Library.