The conversation between human and AI assistant.
[|Human|] 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.
[|AI|] Rorion Gracie is the co-creator. The first event was held in Denver. Colorado.
[|Human|] 
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.