Matthew Stadler brings the concept of "Zwischenstadt" to Seattle. The concept calls for a new interpretation and reorientation of urban space. Stadler believes that the old concept, the city center, is only adequate for a kind of urban space that no longer exists; the new concept, Zwischenstadt, is adequate for the new realities of centerless and globalized urban space. But that is just the surface of the matter. Expect to hear much more from the mind of a man who has made utopia the business of his thought. (Town Hall Seattle, 1119 Eighth Ave, 624-6600. 7:30 pm, $5.)