Hot Wheels Conventions are events sponsored by Mattel to invite Hot Wheels collectors to meet in one place during one or more days, to expose their collections, trade items, and promote discussions around their Hot Wheels Collections. In the events, staff from Mattel can be present to contact collectors and offer lectures. On each event are offered one or more castings to mark the event. File:Placeholder There are two official Hot Wheels Conventions on USA: annual Hot Wheels Nationals Convention , since 2001, and Hot Wheels Collectors Convention on California cities since 1987.