4. Halloween Carnaval

The Buzz -- What began as a small neighborhood celebration in 1987 has burgeoned into a huge extravaganza attracting nearly a half-million revelers each year. A portion of Santa Monica Boulevard is closed to accommodate all the costumed participants and onlookers, who can't get enough of the creativity, eccentricity, and spectacle. A costume contest is held, a queen is crowned, celebrities attend, and traditional festivities like pumpkin-carving and children's activities are sponsored. Of course, you'll also find plenty of food and performances by first-rate bands and vocalists.