Architectural education and preservation are the subtexts of the fun at the 14th annual Build Montclair workshop. At the two sold-out sessions, 50 family teams assemble 55 significant township structures with Lego blocks to place on a huge township floor map. The event is led by Stephen Schwartz of SWS Architects of Maplewood, in Leir Hall of the Montclair Art Museum, Sunday, Feb. 3.