Among those on tap for the one-day event in LA are John Carpenter, Mark Mothersbaugh, Questlove and Terence Blanchard, among others.
Harnick and composer Jerry Bock made up the premier musical-theater songwriting duos of the 1950s and 1960.
She had been diagnosed in February 2021 with an incurable brain tumor.
He won an Oscar for his work in "The Last Emperor."
