Discovery Channel takes over the Greek Theater Wednesday night for a concert and party to tubthump the June 4 debut of its Planet Green channel (the channel formerly known as Discovery Home). Perfs are skedded to include Ludacris, Tommy Lee, ZZ Top's Billy Gibbons, Blue Man Group and others. Proceeds will go to a fund established to help rehab areas around Griffith Park that were torched by recent wildfires....

Thursday's a day for serious yakking. In the afternoon, the Hollywood Radio and Television Society hosts a luncheon event at the Beverly Hilton devoted to how the biz can help keep health care issues at the top of the nation's public policy agenda. Sally Field and Jeffrey Katzenberg are set as speakers. Leeza Gibbons will moderate a panel that is set to include top showrunners of shows that work in scrubs: Neal Baer of "Law & Order: SVU" (who really is a licensed physician), Bill Lawrence of "Scrubs" and John Wells of "ER"... In the evening, the Academy of Television Arts & Sciences parses LGBT issues in TV with a sesh at its North Hollywood HQ that will include thesps Billy Baldwin, Billy Crystal, Ron Rifkin, "Dirty Sexy Money" creator Craig Wright and Showtime's Robert Greenblatt. Bruce Vilanch is sure to keep things interesting as moderator...

On Sunday evening, Elmo's in town for the fourth annual presentation of the Fred Rogers Memorial Scholarships, also at the Leonard Goldenson Theater at ATAS' NoHo home base. Three $10,000 scholarships will be presented by ATAS and Ernst & Young to three grad students pursuing careers in children's media, in honor of the late host of PBS' enduring "Mister Rogers' Neighborhood." Also on hand for the 5 p.m. presentation will be Mrs. Mr. Rogers, Joanne Rogers, and actor David Newell, aka Mr. McFeeley.

Call it pay TV, only in a theater. The much-loved Showtime/public radio skein "This American Life," hosted by Ira Glass, will mount a live show on May 1 at NYU's Skirball Center for the Performing Arts that will be beamed out via high-def satcast to more than 300 theaters that are part of National CineMedia Fathom digital network. Event promises to show behind-the-scenes clips, outtakes, and a live audience Q&A with Glass, and it will help tubthump the sophomore season bow of the TV rendition on May 4. For tix or more info click here....

Good news today for Aardman Animations nuts. Disney Channel has licensed a preschooler skein from Aardman, "Timmy," about a cuddly 3-year-old lamb "with a lot to learn." He's based on designs by the great Aardman animator Nick Park, and a character already known to fans of Aardman's "Shaun the Sheep" series. Disney calls "Timmy" to be Aardman's first foray into wee kidvid territory (which seems surprising), but I'm guessing it'll still have those subtle-wacky touches that we love so much in Aardman's "Wallace and Gromit" (Timmy first appeared in the "Wallace and Gromit" short "Wallace and Gromit" in a Close Shave") and "Creature Comforts" et al ....

Speaking of kidvid, those of us who were raised on "Mister Rogers' Neighborhood" will be wishing we could be in Pittsburgh on Thursday for the preem of "Speedy Delivery," a docu on the long-running PBS series by helmer-producer Paul Germain. Pic is described as a retrospective on the show through the eyes of David "Mr. McFeely" Newell (pictured left), who played the 'hood's Speedy Delivery postman from the show's inception in 1968. Hard to believe that Fred Rogers, the Presbyterian minister who saw television as his pulpit to spread the gospel of healthy child-rearing (never forget that "Mister Rogers'" is as much designed to teach moms and dads how to cope as it is to entertain kids) has been gone for more than five years. Thankfully, his gentle soul lives on in those 900 segs that should run forever. For more info on "Speedy Delivery," check out the doc's website right here. (Just thinking about "Mister Rogers'" makes me want to put on a sweater and change my shoes.)