THEATER GANG Directed by Bill Garrett, “Harvey” is being staged Tues. to Sat., Nov. 15 through 19 by the Calabasas High School theater department. Courtesy of Patrick Garrett The concept of tolerance for those who are different is a centralizing theme in Mary Chase’s 1944 Pulitzer Prize-winning play “Harvey,” concerning mild-mannered Elwood P. Dowd, who claims