Join the Young Urbanists for an urban arts salon, featuring work of all media by our city's young "makers": writers, designers, artists, computer geeks and more. Next Tuesday evening's event includespresentations by Anton Willis of Lunescent, a project of Civil Twilight; John Cary of Public Architecture, a new architecture firm model solving practical problems through education, advocacy and the design of public spaces and amenities; and Kearstin Krehbiel, who is inventing new ways of designing permeable sidewalk landscaping for the San Francisco Parks Trust.