Circus of the Stars, on CBS
TV.com; Wikipedia

This was a series of specials that aired (more or less) annually between 1977 and 1994. I couldn't possibly have seen more than a few installments, probably in the late 80s, early 90s. Stars from various movies and TV shows or whatever would perform circus acts. I don't remember the show very well, but it seems to me most of each installment showed the stars training for their acts, which we got to see them actually perform at the end of the show in an actual circus setting. Probably a lot of the stars I didn't even know, but some of them I surely did. It's a shame I don't remember it better, but I'm sure it was fun to watch, at the time.

(I'm not including a link to IMDb because the site has a separate page for each individual installment... and I don't want 19 links to one site.)