I definitely remember Prairie Dawn's plays.
"Oh welcome, oh welcome to our little play, we're so glad, we're so glad you joined us today" (I remember that little tune!
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The main one I recall is a play about brushing your teeth and I remember Herry being a tooth. I can't recall much beyond that. But another one she did was about the parts of the face and that was really cool! Herry, Cookie Monster, Bert and Ernie and Grover were all in it.
This is a classic skit- Prairie Dawn’s face pageant. Prairie plays the piano and says “The Sesame Street Little Theater proudly presents, “Let’s Make a Face”. As Prairie plays the piano, different characters come out with face parts and sing a verse about them. Ernie starts with a picture of eyes. (ends his rhyme by saying the eyes look like knives?) Prairie repeats it questioningly and Ernie laughs his trademark laugh and exits. Herry comes out with nose picture and at end of his rhyme says sometimes it’s worn on the face upside down. Prairie tells him, “No, it’s not. Now, cut that out.” Cookie Monster asks Prairie if he’s next and she tells him yes. Then he has to ask what part of the face he has and she has to tell him it’s a mouth. Cookie ends song by saying he likes mouth best when it’s eating! And then he names different cookies for example and Prairie ushers him out. When she calls the next two on stage, Bert asks, “Are you ready Grover?” And Grover says, “Yes, I am, Bert.” (It’s just really funny and cool to hear two Frank Oz characters talking to each other and saying each other’s name.) Then they sing about ears and Grover breaks off after a while and after Bert gives an obvious rhyme (“Let’s give 3 loud cheers for these things we call our ….”) Grover finishes with “Bellybuttons” and Bert chases him off the stage, correcting him saying, “Ears! They’re called ears! We rehearsed this!” and Grover says he’s sorry- he forgot. All of them come out then to put the face in place and get it wrong twice until they get it right on the third time. At the end of the song they all hum behind Prairie and then go out and run off stage, Ernie holds the eye picture over his eye and runs off too.
You can see this sketch on the 1986 Sesame Street Home Video release "I'm Glad I'm Me" (which is well worth getting, by the way. Besides this sketch, there's tons of other great songs and sketches, including 3 Kermit appearances!)
You can see a complete review of that video (and lots others) on this thread.
http://forum.muppetcentral.com/showthread.php?t=22585&page=7
One other neat thing is that on the "Play with me Sesame" series, Prairie still sings her "welcome, oh welcome" song whenever they're showing off the kids' artwork. The words are a little changed, of course, but the it's the same tune and same intro there. I thought that was pretty cool.