What is the fine-grained topic of the following text: In 1985, when Bill Baggett was Chairman of the Art Department and E. G. Licka director of the Woods Gallery (now the Southern Miss Museum of Art), at the time when the University was celebrating its 75th anniversary, Thornton Willis was invited as the artist of the celebration show. Only return the topic.
Thornton Willis being invited as the artist for University's 75th anniversary celebration show.