Linda Blair, who played 'Det. Diana Ballard' on Supernatural episode "The Usual Suspects" (episode #2.07), is scheduled to attend Dragon*Con 2008, to be held Labor Day weekend (August 29 – September 1, 2008) in Atlanta, Georgia, USA.
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Source: Dragon*Con website.
Disclaimer: WinchesterBros.com and MediaBlvd.com are in no way connected to the convention.