For one Saturday in April, tens of thousands converge on UC Berkeley to discover all the campus has to offer. More than a typical university open house, Cal Day offers art shows and exhibits, music recitals, lecture series from the various academic departments, events for children and families, tours of the campus, and information for prospective students. There are food, games, and fun for all; the Web site outlines the specifics. This is the perfect opportunity to check out the campus and learn something new.