Though it is called Westweek, the Pacific Design Center's annual presntation of decorator lectures, art exhibits, cocktail parties and product launches is packed into two days: March 26 and 27. Times staff writer David A. Keeps was on hand as showrooms premiered their new furnishings. Among them was work of David Weeks, known primarily for his lighting, who kicks up his feet on his first upholstered furniture line, Sculpt, at the Ralph Pucci Showroom in the Pacific Design Center. The light fixtures on the wall are Week's designs too.