See this example properly formatted in the QUT Cite tool.
Artist/Curator. (Year). Exhibition name [Format]. Gallery, City, ST, Country.
APT9 [Exhibition]. (2018-2019). Gallery of Modern Art, Brisbane, Qld, Australia.
Wallace, A. (2019-2020). Strange ways [Exhibition]. QUT Art Museum, Brisbane, Qld, Australia.
List the name of the exhibition first unless you have the name of the artist or curator.
The state abbreviation is used for the USA and Australia.
Title [Format]. (Year). Publisher.
Marlene Dumas: The image as burden [Exhibition catalogue]. (2014). Tate Publishing.
Exhibition catalogues seldom have an identifiable author. Instead, the title is used to identify the catalogue in a reference list.
The publisher will be the organisation who created the catalogue: the festival, professional body, or gallery.
The artist is responsible for the artworks, but usually not for creating the catalogue. For this reason, the artist in not named specifically in the reference, unless they happen to have their name in the exhibition title.