Arena Stage, Thomas C. Fichandler, executive director, Zelda Fichandler, producing director presents, in the Arena, the American premiere of "Moonchildren," by Michael Weller, produced by Zelda Fichandler, directed by Alan Schneider, setting by William Ritman, costumes by Marjorie Slaiman, lighting by Vance Sorrells, production manager Hugh Lester, technical director Henry R. Gorfein, by arrangement with Martin Rosen, Nepenthe Productions, Ltd. and The Royal Court Theater.