I dont have much info about it so i just quote:
It is the tenth anniversary of the DreamCon Dreamcast convention this year. In celebration, this year the convention has returned after an eight year hiatus.

The 2015 DreamCon will be taking place at the Con on the Cob from October 15 to October 18, 2015 in Richfield, Ohio.
Source: http://www.dreamcast-scene.com/commu...?f=24&t=152571