There's also A-Kon 23 which I will be attending. The event is in Dallas, TX and takes place on June 1st - 3rd at the Sheraton Hotel in Dallas. More info here: http://www.a-kon.com/.

Notable appeareances:

Kyle Herbert (voice actor for anime and video games)
Cherami Leigh (anime voice actress and live action actress)
Quinton Flynn (A-List voice actor whose work has appeared on several video games, american animation, and anime)

...and more.