Web 2.0 Summit Alumni: If you attended Web 2.0 Summit (formerly the Web 2.0 Conference) in the past, you will receive an invitation to register for the 2009 event via email, so you do not need to request an invitation. If you are a past Summit participant and have not received an invitation, please send a message to confreg@oreilly.com. Please include which year you attended and/or your registration number in the message.

Web 2.0 Expo Attendees: If you attended a past Web 2.0 Expo San Francisco, New York, Berlin, or Tokyo in 2007 or 2008, you will need to request an invitation to attend Web 2.0 Summit. Attendance at Web 2.0 Expo does not guarantee an invitation to Web 2.0 Summit.