Friday: Visit Hanmi Gallery in the shadow of the BT Tower, find the gum art in and around the space and win a special book. Open till 6pm, Saturday noon to 4pm.
The V&A treble of 'Summer Camp' Lates looking at design starts tonight unpicking the creative process. Free entry, open till 10pm.
The Natural History Museumis also open after hours, free admission (no school kids!) until 10pm.
Saturday: It's the last free Daylight Music session with The Robot Heart, Laura Hocking and The Long Goodbye, and The Gentle Good at Union Chapel, Islington between 12-2pm.
Spend the day at Hackney Wicked. Heck, spend the entire weekend there.
Or take a break and pop over to Hackney Downs to watch the London Open Bike Polo Tournament.
Peruse the free bits of Vintage at Southbank Centre.
Sunday: Hang out at ExCel Arena Docklands to watch the Virgin Active Triathlon, with swimming in the Thames at Royal Victoria Docks.
Enjoy jazz in Walpole Park, Ealing, £4 adults, 1-10pm.
Count frogs and newts in Croydon.
Monday: Celebrate the Roxy's fifth birthday with a free double bill of 80s classic movies. RSVP if you want to find out what they are!
Tuesday: The Baby Bathhouse Brain Battle quiz night in Stoke Newington is just £1. Reserve your table, 8-10pm.
Wednesday: Go to a free gig at Highbury's Buffalo Bar from 8pm with four bands on the bill, kicking off with "Twickenham's finest" Karvel.
Thursday: Join the free talk at Whitechapel Gallery: Shamita Sharmacharja on Fred Sandba at 7pm.