PORTLAND — The mayor of Portland, Maine, will be presenting singer Liza Minnelli a key to the city before her performance at Merrill Auditorium.

Minnelli is singing her greatest hits and material from new CD, “Confessions,” tonight to kick off the 80th season of Portland Ovations. Mayor Nicholas Mavodones will present a key to the city at the beginning of the show.

Minnelli, the daughter of Judy Garland, won an Oscar and a Golden Globe for her portrayal of Sally Bowles in the 1972 film “Cabaret.”

Minnelli originally was scheduled to receive the key on Tuesday, but the presentation was moved back to Wednesday because of time constraints.