Elephant and Castle for Elefest 2010 by laszlo-photo used under a Creative Commons attribution licence.
Tonight: Rain or shine (looks like rain), Tango Spitalfields goes ahead under the canopy or inside the covered market structure opposite Leon restaurant between 7-9.45pm with a free class for absolute beginners at 6.30pm.
The last Lockstock Festival of the year infiltrates Camden Lock market and various venues for free music, comedy, arts... 2pm-1am.
Friday: Uncover science at the Natural History Museum's after hours adults-only free party between 4-10pm.
It's Malaysia Night in Trafalgar Square with food fair from 3pm.
Saturday: It's Capital Growth's Open Gardens Day. Meet the green fingers behind the gardens and be inspired to create your own. If you've got a bike you can visit all of these amazing community food growing spaces with this map. We want photos of the Kings Cross Skip Garden and more, please!
The London Art Book Fair runs all weekend at Whitechapel Gallery with numerous book signings, talks and workshops. At 2.15pm this afternoon, join a free discussion about the phenomenon of e-zines and online magazines.
One Yoga and Yoga Therapy Centre Open Day offers free taster sessions for those who've never done a sun salutation or got stuck in a downward dog. Between 10am-5pm, book ahead online.
It's Walk London's Autumn Ambles Weekend with over 50 guided walks trotting off all over town. Walks vary in length from under 4 miles to the 21.5 mile Green Chain Mega Walk and are all free.
Join London Folk at Elefest for a council-funded night of local strangeness and fun with John Crow, Chris-one-eye-grey-Roberts, London Dreamtime, exploding cinema and loads more. At Hotel Elephant next to the wonderful Newington Causeway Job Centre (between Borough Tube and elephant Tube).
Sunday: The Regent's Park Harvest Festival takes place at The Regents Park Allotment, Inner Cirle intersection with Chester Road between 10am-4pm.
Rummage for a bargain on the last day of Westfield's big brand car booty.
Monday: A free talk at New Acropolis marks the start of a new Study Philosophy 16 week course. Get inspired... sign up for the rest? You don't have to. 7.30pm.
Tuesday: Brave souls 'Stand up for the First Time' at The Miller, London Bridge. Each does 5 mins. No entry fee but audience donate at the end. Hosted by Hoopla Impro.
London on the Cheap this week is sponsored by Pizza Hut: If you're out and about having a frugal fun family adventure this weekend Kids Eat Free at Pizza Hut. For every adult main course or adult lunchtime buffet purchased, an accompanying child can choose from either a free 2 course kids meal (includes a drink) or a free kids lunchtime buffet (includes pizza, pasta and salad). Offer ends January 9 2011. Find more details about the offer online.