Samantha Smith (Mary Winchester), Fredric Lehne (The Yellow-Eyed Demon) and Richard Speight Jr. (The Trickster) are scheduled to attend Rogue Events' third Asylum convention, to be held on 2009.
As was already announced, Gabriel Tigerman (Andrew "Andy" Gallagher) is also scheduled to attend the event.
For more information on the convention, click here.
Source: Rogue Events.
Disclaimer: WinchesterBros.com and MediaBlvd.com are in no way connected to the event.