Lucille Ball is mentioned on “The Marvelous Mrs. Maisel” (set in 1959).  Season 2, episode 6 “Let’s Face the Music and Dance.”  

During the summer of 1959, Lucille Ball was busy shooting “Milton Berle Hides Out at the Ricardos” (LDCH #11).  Coincidentally, Milton Berle is also mentioned in the same episode of “Mrs. Maisel”.  Earlier in the summer of ‘59, America saw “Lucy’s Summer Vacation” (LDCH #10) where she, like Mrs. Maisel, spent the summer out of the city, in the great outdoors!