The month-long celebration of architecture is back in 2015 with exhibitions, installations, talks, debates, screenings, tours and family activities organised and hosted by the city's leading cultural institutions. The Design Museum, Royal Academy of Arts, Royal Institute of British Architects and the V&A will all be involved, while an expanded international programme will include the British Council's International Architecture Showcase and the Serpentine's Summer Pavilion, this year designed by Spanish architects SelgasCano. This year's festival theme is 'Work in Progress' and explores how work has transformed the city and its role in connecting London sociably and globally. RIBA London will present their free Summer Showcase at Pop Brixton, SW9 (June 4-28) and, in partnership with Associated Projects and Open Studios, RIBA have launched an open call for proposals centred around this year's theme and selected projects will be included in the festival programme. Find out how to enter and find the latest line-up at the London Festival of Architecture website.