So, cities that host (or at least have their name on) both an MLB franchise and a NASCAR track include: Atlanta (the Braves play in Cobb County and the speedway is in Hampton, but both of them identify with Atlanta, so ...),Cincinnati (Kentucky Speedway in Sparta, KY is purty close, plus Johnny Bench is, like, the NASCAR-iest Hall of Famer there is), Dallas/Ft. Worth/ArlingtonKansas City (the ball team is on the Missouri side and the speedway is on the Kansas side) Las Vegas (the ball team hasn't yet arrived), Miami (the speedway is in Homestead), Phoenix (track is in Avondale). Other kind-of-close-to-MLB-towns-but-not-really NASCAR tracks include Michigan International Speedway (ninety minutes or so from Detroit), New Hampshire Motor Speedway (75 minutes and a state border from Boston), and Sonoma Raceway (an hour on a good-traffic day from San Francisco). That is actually more overlap than I would have guessed, but obviously the two sports have a lot of unexplored room for synergy. It might make some sense to have future events at the home team's nearest track.