The 24th International World Wide Web Conference will be held May 18-22, 2015 - in Florence, Italy - with a chosen venue of the Fortezza de Basso
In recent years, the 2014 conference was held in South Korea:
...and the 2013 conference was held in Rio de Janeiro, Brazil
videos of the keynotes speeches...
Some recent threads of discussion related to this InfoQ article series has raised my interest in possibly attending the 2015 conference...