1) “American Idol” finale, 8-11 p.m. ET, ABC. Last week, voters picked their final three – Willie Spence, Grace Kinstler and Chayce Beckham. That ousted Casey Bishop, drawing surprise and complaints – similar to when Chris Daughtry finished fourth, 15 years ago. Tonight, we’ll get music from nine finalists (one dropped out) … from the judges … and from Alessia Cara (shown here), Luke Combs, Sheryl Crow, Lindsey Buckingham, Mickey Guyton, Leona Lewis, Chaka Khan, Fall Out Boy and Macklemore.
2) “Billboard Music Awards,” 8-11 p.m. (ET), NBC. To complicate our lives, NBC throws this show against “Idol.” (On the West Coast, people can view them one at a time; both are at 5 p.m. PT, rerunning at 8.) Nick Jonas hosts, with a ton of performers. They include Pink, The Weeknd, Bad Bunny and Karol G, plus groups, old (Duran Duran) and newer (BTS, AJR, Glass Animals, Twenty One Pilots). Also, H.E.R. links with DJ Khaled and Migos. Drake gets the artist-of-the-decade award. He’s also up for artist of the year, alongside Taylor Swift, Pop Smoke, Juice Wrld and The Weeknd.
3) “NCIS: New Orleans” series finale, 10 p.m., CBS. This should be a cheery way to end a seven-year run: Dwayne Pride and Rita Devereaux (Scott Bakula and Chelsea Field, married in real life) hope to marry in Dr. Wade’s backyard, then have a reception with Big Easy music. Complications involve Connor, the son he just learned about, and Connor’s scheming mother Sasha.
4) “Flatbush Misdemeanors” debut, 10:30 p.m., Showtime. This all started when two comics made a “zero-budget” digital series. Now they’ve upgraded; they play quiet friends (an artist and a teacher) in a noisy Brooklyn; the result works in a droll, “Atlanta” sort of way. That’s in a huge night for Showtime: “The Chi” and “Black Monday” start their seasons at 9 and 10 p.m.; “Ziwe” debuts at 11.
5) ALSO: “Atlantic Crossing” (9 p.m., PBS), the excellent World War II drama, concludes; Franklin Roosevelt’s health fades, the princess’ marriage wobbles, but the war is going well. “Story of Late Night” (9 p.m. ET, CNN) has a strong, Letterman-based hour. And HBO’s “In Treatment” returns (9 and 9:30) today and Monday. Uzo Aduba plays a therapist, sometimes working online. Her first client is beautifully played by Anthony Ramos, who stars in the new “In the Heights” movie musical.