- London Festival of Architecture celebrates the playful city with loads of events until 8 July.
- Greenwich and Docklands International Festival begins with Prometheus, giant insects and a 30ft pig (absolutely free, all of it).
- The first ever Junior Open House Festival means lots to explore and do with the kids discovering architecture around the city (free).
- West End Live brings West End musicals out of the theatres and into Trafalgar Square with live performances from 11am on Saturday and midday on Sunday (free).
- City of London Festival begins with Tony Hadley on Millennium Bridge, a free performance at Waterloo Station, street pianos, bell ringing and loads of classical music recitals. Read our preview and check out the listings online.
- Camberwell Arts Festival's final weekend see Camberwell College of Arts open up with hands on activities and cinema in the Church Street rec on Saturday, then the Puppet Games and picnic on Sunday (free).
- Bow Arts Open 2012 means open studios and an art fair throughout the weekend, plus a Midsummer Fair on Sunday (free).
- AP & Beyond festival sees artists and musicians around Alexandra Palace open their doors to the public plus local exhibitions, concerts and workshops (free).
- The London Indian Film Festival begins at Cineworld Haymarket until 3 July and the LGBT and queer friendly POUT Film Festival runs 21-23 June at Apollo Piccadilly.
- Trent Park is open for tours again, this time reliving the golden age of the 1930s (free).
- Brink Festival showcases innovative performance from MA students at Central School of Speech and Drama (free).
- Bow Arts hosts open studios and a midsummer fair and Richmond ARThouse Open Studios Festival also happens this weekend (both free).
- The Anatolian Cultural Fete sets up in Clissold Park, N16 from 2pm on Saturday with a marching band, folk dancing and oil wrestling, until 1 July (free entry).
- Taste London turns Regents Park into a food fair (advance tickets from £25.80).
- Try 30 Cotswold ales at the Duke of Hamilton pub in Hampstead village during their beer festival.
- Wellcome Collection is open late for Elements, an evening of activities, talks, performance and live experiments all over the building from 7-11pm (free).
- The Chinese Visual Festival opening gala takes place at the Free Word Centre Farringdon (£10).
- The Gate cinema's screening Withnail and I at 10pm, to raise money for Plan UK (tickets £8.50 plus a donation).
- Bishopsgate Institute's open day offers free taster courses, talks, walks and tours from 10.30am-3.45pm (free).
- The Hilly Fields Midsummer Fayre brings stalls, crafts, music and tug 'o war to Brockley's favourite green space between 12-5pm (free entry).
- And outside, Spitalfields Summer Music Festival closes with a Midsummer Street Party from midday till 5.30pm (free)
- Visit Winchmore Hill's all day Fancy Fair from 10am (free).
- Have a whale of a time at this year's Big Day Out on Furzedown Rec, Wandsworth with stalls, kids' activities, dance and music performance between 12-6pm (£2 entry).
- Head down to Wapping for the Summer Shindig.
- The new Harringay Market supporting local food and art opens from 11am-3pm.
- Hampstead Summer Festival culminates with its Big Fair on Heath Street from 10.30am-5pm, including a free screening of the King's Speech, treasure trail, sports, music, chess and all sorts of stalls (free).
- Travel by boat through Islington Tunnel with the Canal Museum (£8.30/£6).
- Shop at Clerkenwell Vintage Fashion Fair in the Old Finsbury Town Hall, Rosebery Avenue from 11am-5pm (£4 entry).
- England play Italy in the Euro 2012 quarter-finals at 7.45pm.
Other good stuff:
- Our latest theatre reviews and art reviews
- Books and spoken word events
- Your week in geek
- Things to do for a fiver or less
- Our pick of comedy gigs plus a guide to watching live comedy in London
- Free things to do in London
- Museums and Galleries
Photo by Ben Brown via the Londonist Flickrpool.