This weekend, our sandy shores play host to a troupe of professional dancers trained in the art of piques, pirouettes, and pas de chats. On Sunday, April 5, at 3 p.m., members of State Street Ballet will present Divination by Flight, a site-specific performance at the picturesque Mesa Lane beach. Spectators are encouraged to bring their families, friends, and picnic lunches. Free. Call 895-4359 for detailed directions to location.