AMG's and non-AMG's welcome. I will be organizing a caravan from the DC area so if anyone is interested contact me. Here is the organizers post from another forum:
Details from MBUSA

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Here it is... think of this as your trailer to yhe upcoming AMG mercedes weekend swiftly approaching us.

First off there is now a deadline for registration of September 21st!!! If your name is not in on time you will be not admitted to MBUSA HQ, but can participate to in the rest of the weekend. Also this goes without saying... open to mercedes vehicles only. That is a non flexable rule, set but mercedes themselves.

We are limiting this event to 100cars a number we are not near so dont worry.

Our meeting with Rob and his staff went very well. Mercedes is going to great lengths to make this event a memorable one!!! Doors to MBUSA will open around 9am.

Some type of breakfast/ coffee combo will be served. A small car show/member showcase will take place where all those who attend will vote for those cars they like best. There will be different types of car classes for everyone to see and compete in. There will be photo oppurtunities with a car that we all could dream to imagine few could afford(one of the most expensive vehicles mercedes produced and the hottest in recent history), there will be a show case of AMG technology available no where else accept to those with in the industry.

Lunch will be provided by our hosts as well. After lunch a 45minute presentation will be presented to us. After the presentation we will have a short Q&A with a representative from an industry leading PARTNER and another representative CLOSELY linked to AMG technology and future plans of Mercedes Benz USA. Prior to the Day's end there will be a short award ceremony and reflection up on the day's event.

This should be complete by approximately 3:30 in the afternoon. There will be prizes and gifts for everyone.

For those who are already signed up could you please send me your information that mercedes is looking for via PM or preferably email to NortheastAMG@yahoo.com. This is for an accurate head count and for the first competition amongst all those who attend.
Information
First Name/ Last Name/ Forum and Screen name
Home address(dont worry this will not be entered in a Mailing list)
Vehicle
Names of those attending with you(first and last name) ...
Example:
Peter/ wouldntuliketoknow/ MBworld 55fanatic
155 any street Boston, MA 09023
2000 ML55
Mom, Dad, Mike Jones