Directly from the official site:
Windows Phone Week is a series of events created for the developer community by Windows Phone Developer MVPs.
The events are in nine countries, encouraging developers from around the world to explore app and gaming development.
Each event has a unique agenda, format and registration process so please check the details at the location nearest you.
Although at this stage only 9 countries are participating, there are plans to expand to other territories, so stay tuned! ;)