Since its announcement, UFC 306 celebrating Mexican Independence Day at the Sphere in Las Vegas was characterized as a ‘one-off’ event.  On Tuesday, following Dana White’s Contender Series, UFC CEO  Dana White explained how a rift with partner MGM led to the fight promotion hosting an event at the state-of-the-art venue. Last year’s “Noche UFC” event was held at T-Mobile Arena in Las Vegas.  T-Mobile Arena is owned by MGM Resorts International and Anschutz Entertainment Group (AEG).  The UFC has a partnership with MGM.  When the fight promotion wanted to book T-Mobile Arena for this year’s “Noche” event, the venue wasn’t available