The Question and Answer section for Dubliners is a great resource to ask questions, find answers, and discuss the novel.
I think the sign represents the death of the priest.
He does not buy anything because of his lack of money, late arrival, and most notably, his general disappointment in not making a connection with the girl he likes at the bazzar.
Mrs. Mooney left her husband because he was an alcoholic. When drinking, he was extremely violent.