One Night in Miami is a fictional account of one incredible night where icons Muhammad Ali, Malcolm X, Sam Cooke, and Jim Brown gathered discussing their roles in the civil rights movement and cultural upheaval of the 60s.
Director Regina King and actor Beau Bridges both appeared in Jerry Maguire but didn't share any scenes.
At the very start of the movie the boxing match is credited as taking place at "Wembley Park". The arena is actually called Wembley Stadium. Wembley Park is the name of one of the London Underground (tube) stations that serves the stadium.