"History is a threadbare fabric [...] full of holes, tears and rents," says a character in Mac Wellman's new play, Two September, now in a limited run at the Flea. The playwright is interested in examining such holes in history; in this case, the beginnings of American involvement in Vietnam, which he traces back to the closing days of World War II. At the same time, Wellman is concerned with the marginalization of the political left. Unfortunately, while Two September, which has been directed by Loy Arcenas, contains some interesting ideas and brings into focus a history that's probably unknown to the majority of Americans, it's laden with undramatically presented exposition and only rare[...]