Ealing Jazz Festival, Walpole Park, Mattock Lane, W5 (0181-758 5743).
4-11 August, from 7.30pm. Free if you just want to lie on the grass but if you'd prefer a seat in the marquee, tickets cost pounds 3 . For the highlight get down on Sunday when the grandfather of British jazz, Tommy McQuater, opens the festival. Other players include John Mclevy, the James Chadwick quartet, Bill Skeat, Mike Peter's world famous jazz band... the list seems endless.
Swiss Cottage Festival, Swiss Cottage, Avenue Road, NW3 (0171-586 8731).
All day Sunday 11 August. Free. In the small park here this is very much a community do: there's theatre for kids, games, competitions and, towards the evening, a music stage where local youth bands show off their talents with a mix of jazz, reggae, rock, and Latin music. If this feast fails to satisfy excess energy, Hampstead Heath is a hearty walk uphill.
Tango, Broadgate Arena Summer Entertainments, Broadgate Centre, Eldon Street, EC2 (0171 588 6565) Wednesday 28 August, from 5.30-9pm. Free. The City of London is normally silent after 6pm, especially in August, when most of the big players from the dealing houses around the Broadgate complex are sailing their yachts. But the spirit of Buenos Aires will bring it alive at the end of the month. Anyone can go to the arena and learn (or just watch) "real" Argentine Tango.
Hay's Galleria Oyster and Seafood Fair, Hay's Galleria, London Bridge City, Tooley Street, SE1 (0171-403 4758).
30 August-1 September 11am-7pm . What is, for most of the rest of the year, a quiet and mostly empty shopping plaza, comes as alive as a bivalve for the annual fishy festival, including the National Fishmongers Craftsmanship competition.
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