Microsoft's limiting the attendance at this year's Professional Developers Conference in Redmond, but it added 65 regional "mini" PDC events in the US and worldwide to compensate. PDC10 at Redmond is currently sold out but the event can be seen via live stream, starting October 28 at 9:00am PST.
The events will include training and access to various members of the Azure, Windows Phone 7, Windows and other teams, according to company officials.
Here're some of the places where you can attend at a mini PDC: Beijing, Shanghai, Guangzhou, Hyderabad, Mumbai, Delhi, Bangalore, Tokyo, Mountain View, California, and multiple other cities in Europe, South America and Australia. Microsoft's updating regional event map regularly. Those interested in attending a local event can register via regional event site.
More Info: PDC10 Local Events