What year is it? On “Mad Men,” it’s 1966. “Magic City” has just welcomed New Year’s Day, 1959. But out here in the “real” world, 1984 is breaking out all over. And I’m not just talking about a new album from Madonna.

“Who Do You Think You Are?” (7 p.m., NBC) repeats a segment concerning Lionel Richie’s search for his roots. CBS presents “Lionel Richie and Friends — In Concert” at 8 p.m.

Richie was red-hot in 1984, riding a wave of popular hits on the still evolving MTV network. He sang “All Night Long” as the closing act of the 1984 Olympic Games in Los Angeles, an over-the-top performance featuring some kind of spaceship and produced by former Monkee Michael Nesmith.

To what do we owe this Lionel revival? This embarrassment of Richie(s)?

Tonight’s CBS concert is presented by the Academy of Country Music and features some of today’s hottest country stars performing as solo acts or in duet with the former Commodore and father of Nicole. Look for Jason Aldean, the Band Perry, Luke Bryan, Sara Evans, Lady Antebellum, Martina McBride, Jennifer Nettles, Rascal Flatts, Kenny Chesney, Tim McGraw and Kenny Rogers.

American country artists aren’t the only big fans of the man behind “Dancing on the Ceiling.” Richie is apparently huge in the Arab world, having performed to sellout crowds in Morocco, Dubai, Qatar and Libya, where he performed in 2006 for that nation’s dictator, Moammar Gadhafi.

Tonight’s other highlights

• A maker of blinds pulls some strings on “Undercover Boss” (7 p.m., CBS).

• A search for lost marital bliss on “The Finder” (7 p.m., Fox).

• A cynical American (Humphrey Bogart) lets go of an old flame (Ingrid Bergman) and rediscovers his idealism in the 1942 romance “Casablanca” (7 p.m., TCM).

• Nick faces down his worst enemy on “Grimm” (8 p.m., NBC, TV-14).

• Walter packs his bags for an alternative universe on “Fringe” (8 p.m., Fox).

• “Say Yes to the Dress: Bridesmaids” (8 p.m., TLC) returns to Atlanta.

• A drug-dealing tenant complicates a bankruptcy case on “Fairly Legal” (8 p.m., USA, TV-PG).

• An undercover sting enters the world of drag performers on “In Plain Sight” (9 p.m., USA, TV-PG).