Summer, we hate to see you go. But we love watching you leaf. PLAY Gardner After Hours What: The Isabella Stewart Gardner Museum pairs cocktails and live music with fine art at its new monthly mixer. Why: Drink in some culture. When: Tonight, 5-9 p.m. Where: 280 The Fenway, Fenway. Tickets at 617-278-5156. Henna Party What: Get inked at this Indian bazaar and henna tattoo party. Why: It’s better than bangles and rings. When: Tonight, 6-8 p.m. Where: Shake the Tree, 95 Salem St., North End (617-742-0484). EAT Kingston Station Opens What: Brand-new downtown space marries bistro fare with an airy, tile-covered space. Why: Think chicken paillard and steak frites inside a vintage subway station — only cleaner. When: Mon.-Fri., 11:30 a.m.-2 a.m.; Sat., 5 p.m.-2 a.m. Where: 25 Kingston St., Downtown (617-482-6282). LEARN Opera 101 What: Delve into the Boston Lyric Opera’s upcoming season during a six-week class. Why: Edumacate yourself. When: Session one starts tonight, 7-8:30 p.m. Where: Mary Norton Hall, Old South Church, 645 Boylston St., across from the Boston Public Library (617-542-4912 ext. 242). Register online at blo.org. SHOP (and DRINK) Diseño Champagne Brunch What: Stop by the Latin-inspired home store for empanadas and mimosas. Why: Get a sneak peak of what’s new for fall. When: Sun., noon-3 p.m. Where: 409 Harrison Ave., South End (617-423-2008).