Award-winning playwrights Simon Stephens and Annie Baker will discuss their views on collaboration, as well as the state of contemporary plays in the United Kingdom and the United States at The Strand bookstore in Union Square. Christian Parker, the associate artistic director for the Atlantic Theater Company, will moderate the discussion. Guests must purchase a $10 Strand gift card to attend the event. The bookstore will also raffle off two tickets to see Stephens' new play, "Harper Regan," when it opens this fall.