An interview with Gideon Glick and Lindsay Mendez about their roles in the new Joshua Harmon play called "Significant Other"; an interview with Mary Louise Wilson, whose credits include a Tony winning performance in "Grey Gardens," her Obie and Drama Desk-winning work in "Full Gallop" and her appearance on Broadway in "On the Twentieth Century," about her newly released book, "My First Hundred Years in Show Business"; and reviews of two new off-Broadway productions - the Lincoln Center Theater production of Douglas Carter Bean's "Shows for Days," starring Patti LuPone and Michael Urie, and the Manhattan Theatre Club staging of Melissa Ross's "Of Good Stock," highlight the July 4 edition of On Stage, hosted by Donna Karger.