NFL preseason (6 p.m., ESPN): Minnesota Vikings at Houston Texans
CMA Music Festival: Country's Night to Rock (7 p.m., Ch. 4): Performers in this three-hour special include Trace Adkins, Jason Aldean, Dierks Bentley, Brooks & Dunn, Kenny Chesney, Julianne Hough, Kid Rock, Lady Antebellum, Miranda Lambert, Martina McBride, Reba McEntire, Brad Paisley, Darius Rucker, Sugarland and Taylor Swift.
History Detectives (8 p.m., Ch. 7): Among the things investigated are a sketch from Stalag 17; and items that might be from the Seadrome — a floating airport.
Inside the Actors Studio (8 p.m., Bravo): Mickey Rourke is interviewed — this ought to be fun.
Great Performances (9 p.m., Ch. 7): A tribute to conductor Herbert von Karajan.
Secret Life of the American Teenager (9 and 11 p.m., ABC Family): Ricky pursues Adrian, who's not interested.
Greek (10 p.m., ABC Family): In the third-season premiere of this entertaining series, Rusty's got grade problems; Casey adjusts to being single; and Dale faces a moral dilemma.
Weeds (11 p.m. Showtime): In the fifth-season finale, Nancy finally learns what happened to Esteban and has to take measures to protect herself.