The UFC was founded by businessman Art Davie and Brazilian martial artist Rorion Gracie, and the first event was held in 1993 at the McNichols Sports Arena in Denver, Colorado. The purpose of the early Ultimate Fighting Championship competitions was to identify the most effective martial art in a contest with minimal rules and no weight classes between competitors of different fighting disciplines.
Given a reference about the creation of the UFC, tell me the member of the Gracie family  who co-created the UFC and the city they hosted the first UFC event.
Rorion Gracie is the co-creator. The first event was held in Denver. Colorado.