May sweeps start tonight, while we’re still in April.

At the least it means there will be no network reruns for now; at the most, it will open the doors for all kind of stunt castings, crossover episodes, sudden character deaths and lavish weddings, among other gimmicks.

One gimmick we can get behind is the latest live episode from “30 Rock” (NBC, 8:30 p.m.), which, the last time it tried this metnod, packed all kind of innovations, surprises and changes (from the live East coast version to the West Coast version) that made it memorable. The plot is about whether “TGS” should remain a live show.

It’s certainly in good company:

“Community” (NBC, 8 p.m.) does a parody of “Law & Order,” in an episode that features Michael K. Williams of “Boardwalk Empire.” And Leslie Knope takes the stage for her city council debate on “Parks and Recreation” (NBC, 9:30 p.m.) against Paul Rudd’s Bobby Newport, in an episode written and directed by star Amy Poehler. And on “The Office” (NBC, 9 p.m.), Ed Helms’ Andy is now unemployed.

Some shows are used to being live, of course: The “American Idol” (Fox, 8 p.m.) results show features a performance from Katy Perry, a Queen tribute band and a former “Idol” contestant I don’t recall at all, Stefano Lagone, perform before the remaining six become a handful.

Not so long ago, it was accomplished among millionaires in a closed room Now the NFL Draft (ESPN, 8 p.m.) is a bigtime, three day entertainment destination all its own, live from Radio City Music Hall for the first round.

Curiously excited about the new “Real Housewives of Atlanta” spinoff, “Don’t Be tardy for the Wedding” (Bravo, 9 p.m.) about brassy Kim Zolciak’s impending ceremony with Atlanta Falcons player Kroy Biermann. Probably because it brings to mind Kim’s wonderfully awful disco song, “Don’t Be Tardy for the Party.”

The modern role for an animal that ran plentiful across the plains is considered in “Facing the Storm: Story of the American Bison” premiering tonight on “Independent Lens” (PBS, 10 p.m., check local listings).

Demi Moore produces a new show starring her friend, a British talk show host, who sits with celebrity women and gets them to open up about sex, life and relationships. “The Conversation with Amanda de Cadenet” (Lifetime, 11 p.m.) is meant to be beyond the similar chats on “The Talk,” intending to go deeper. So there’s insight in how Jane Fonda categorizes her three husbands, considers her mortality. But I’m not sure I need to know her favorite sexual position.

With all its empowering women-power talk, it is at its core just another celebrity gossip show, mining its revelations only if you know that, say Sarah Silverman is really referring to Jimmy Kimmel. Gweneth Paltrow won’t open up over former boyfriends, though. And the show seems to have been created so Moore can discuss her own Ashton Kutcher situation.

On the accompanying series “7 Days of Sex” (Lifetime, 10 p.m.), is a show about couples who try a new form of therapy: Improving their relationships after having sex seven nights in a row.

Carl Quintanilla reports on “The Costco Craze: Inside the Warehouse Giant” (CNBC, 9 p.m.) and ends up taking home massive amounts of toilet paper.

Howard gets a bachelor party on “The Big Bang Theory” (CBS, 8 p.m.).

The Seattle Grace residents finally head to San Francisco for their oral boards on “Grey’s Anatomy” (ABC, 9 p.m.).

It’s Yul Brenner night on Turner Classic Movies with “Triple Cross” (8 p.m.), “The Magnificent Seven” (10:15 p.m.), “Kings of the Sun” (12:30 a.m.), “Double Man” (2:30 a.m.) and “Flight from Ashiya” (4:30 a.m.).

In the first round Stanley Cup Playoffs, it’s Senators at Rangers (NBC Sports, 7 p.m.) in game 7.

In the NBA, it’s Knicks at Bobcats (TNT, 8 p.m.) and Spurs at Warriors (TNT, 10:30 p.m.).

Daytime Talk

Kelly Ripa: Jenna Fischer, Garry Marshall, Katherine Jenkins & Mark Ballas, Matthew Broderick. The Talk: Mary McCormack, Paul Bartolotta. Ellen DeGeneres: Adam Levine, Sophia Grace & Rosie.

Late Talk

David Letterman: Robin Williams, Andrew Luck. Jay Leno: Diane Keaton, Natalie Coughlin, Moby. Jimmy Kimmel: Emily Blunt, Dave Salmoni, Adam Lambert. Jimmy Fallon: Jason Segel, Leelee Sobieski, CC Sabathia, the Lucas Brothers, Kool & the Gang Horns. Craig Ferguson: Toni Collette, Mike Massimino. Tavis Smiley: Ayad Akhtar. Carson Daly: Megan Hilty, Deborah Bassett, We Are Augustines. Jon Stewart: Robert Draper. Stephen Colbert: Jack White. Conan O’Brien: Jack Black, Simon Doonan, Ingrid Michaelson. Chelsea Handler: Alison Brie, Chris Franajola, Jen Kirkman, Matt Braunger.