Sesame Street at Night? is a half-hour PBS special that aired in March of 1977 to celebrate Sesame Street's 1,000th episode. Gene Shalit hosted the special, which also featured a Muppet lookalike of the critic. Featured segments included Grover and Lena Horne singing "How Do You Do?" and clips of 100 celebrity appearances from the show.
According to press materials,
“Shalit is to host an adult 'look' at Sesame Street in a Festival '77 special for PBS. The 30-minute special, Sesame Street at Night? takes its theme from a critic's remark when TV's most popular children's series began eight years ago – 'It's too good for kids.'”