Pier One Theatre invites actors to try out this weekend for David Mamet’s 1984 play, “Glengarry Glen Ross,” to be performed this summer at dates to be set. Directed by Peter Sheppard, auditions are 1-3 p.m. Saturday and Sunday at the Mariner Theatre. There are five major characters and two minor characters with regards to dialogue. The cast is all male, but that can change pending audition turnouts. The script includes mature language throughout.