Just in case you haven't heard of this yet:
Inspired by similar User Groups around the world, the VSTS evangelists in Seattle have come together to create this user group with the help and support of the Microsoft VSTS field and product teams.
The charter of this User Group is to bring together VSTS users in the Puget Sound area to discuss Visual Studio Team System and share their learnings and experience amongst each other.
The User Group will meet once a month at the Microsoft Redmond Campus and will feature speakers from Microsoft as well as the local community.
Unless otherwise mentioned, the talks will be held on the last Wednesday of each month from 6:30pm to 7:30pm. Sogeti will sponsor dinner at the meetings.
Please check it out at: http://www.seattleteamsystem.org/