Final answer:
Broadway honors passed away influential theater figures like Tennessee Williams and Eugene O'Neill by dimming theater lights; both were iconic playwrights whose works significantly impacted American theatre.
Step-by-step explanation:
Broadway theaters have been known to dim their lights in honor of influential individuals in the theatre community who have passed away. Such an event occurred with the deaths of renowned playwrights like Tennessee Williams and Eugene O'Neill, both of whom were highly acclaimed and whose works left a significant imprint on American theatre. Williams, known for plays like The Glass Menagerie and A Streetcar Named Desire, and O'Neill, recognized as America's premier playwright with works like Long Day's Journey Into Night, each had a distinguished impact on the dramatic arts that was commemorated by the Broadway tradition of dimming theater marquee lights.