Black-tie events are formal occasions that require guests to dress in formal attire. These events typically include balls, GALAS, and formals. Balls are large social gatherings where people dance and mingle. GALAS are more formal events that often involve a dinner or show. Formals are similar to GALAS but usually involve a more structured program. All of these events require guests to dress in formal attire such as tuxedos and gowns.