New York City Health Commissioner Dr. Ashwin Vasan will step down this Friday, months earlier than expected, citing personal reasons. Meanwhile, politicians and luminaries joined Monday’s Columbus Day parade, which marched up Fifth Avenue. WNYC’s Ryan Kailath was on the scene. Plus, the Yankees and Mets are both three wins away from a potential Subway World Series, as they compete in their respective league championships. WNYC’s Michael Hill speaks with sportswriter Kavitha Davidson about both teams’ progress and the possible showdown.