Google is to hold a developer day around the world on the 31st of May 2007

Mountain View, California
Sao Paulo, Brazil
London, United Kingdom
Paris, France
Madrid, Spain
Hamburg, Germany
Moscow, Russia
Tokyo, Japan
Sydney, Australia
Beijing, China

From the press release 

MOUNTAIN VIEW, Calif. – On May 31st, Google offices in ten countries will host Google Developer Day™, a global event featuring workshops, keynotes and breakout discussions on Google’s APIs and developer tools.

Focusing on the theme “Building Blocks for Better Web Applications,” Google Developer Day will explore innovative uses of Google developer products to create and enhance applications, integrate with Google services and reach millions of users on Google and beyond