Theatre: THE DIXON GALLERY AND GARDENS. 4339 Park. A one-woman show about the life of the only American and only female who exhibited her work with the Impessionists. Mary Cassatt and the Impressionists. $5. 2 p.m. THEATREWORKS, 2085 Monroe at Florence. Playwrights Present will read FIRSTS, a selection from first plays by Memphis playwrights. Free. 4:45 p.m.