CAcert.org is scheduling ATE’s in the United States this summer.
The first one is scheduled for June 18th, 2011 in the Washington, DC area. See the Wiki Page for specific information.
There a also plans to present ATE’s in New York and Dallas/Ft. Worth in the June time frame. These two events are pending assistance from local CAcert members. If you are interested in helping out, please email email@example.com so that you may be contacted to assist in the planning and organization.