Time Out says
Join the Willesden Green Knitters as they raise money for the homeless by, well, knitting at this sponsored knitathon. They're looking for crafty types to join them in creating woollen goods on the day, but even if you can't knit you can show your support by providing crafts and cakes they can sell, donating long-abandoned balls of wool or popping along to buy some crafts for the Christmas present cupboard. Beginners are welcome, too. Email email@example.com to join in or to find out how else you can help.