Classic TV shows that I saw taped (or filmed): Dick Van Dyke, The Red Skelton Show, The Danny Kaye Show, Juke Box Jury, Art Linklatter's House Party, and a few others back in the Golden Age, including several classic game show tapings.
I would routinely order tickets to shows when I was in grammar school in the late 50s. I just liked getting the tickets in the mail - and that included I Love Lucy. But I think Red Skelton was the first actual show I attended - Juke Box Jury was before that, but it wasn't a show like a real sitcom or variety show.