SBeloved children’s television show “Sesame Street” celebrates the 50th anniversary of its premiere on Sunday.  The special will be hosted by Joseph Gordon-Levitt, and feature guest appearances Patti Labelle, Whoopi Goldberg and Sterling K Brown. Also appearing is Caroll Spinney (the original Big Bird), and Fran Brill. Executive Producer Ben Lehmann says it “was important to nod to our history with just the right amount of nostalgia, but recognize that we’re a current show with something modern and dynamic.” This Saturday, “Sesame Street” celebrates with “Sesame Street’s 50th Anniversary Celebration” on HBO (7EST/PST). An encore presentation will air on PBS November 17th.