(© Tristan Fuge)
The dedication will a ribbon-cutting ceremony where a custom decal will be unveiled on the front of the open-top, red double-decker bus which scores of sightseers will be able to ride every day.
Her numerous stage credits include Kiss of the Spider Woman, Sondheim on Sondheim, and Into the Woods.
Williams' new television series, 666 Park Avenue, premieres on September 30. She has previously been seen on Desperate Housewives and Ugly Betty.
