Take to the water for 21+ trick-or-treating this year—the 7th annual Halloween on the Harbor ferries adult revelers to participating Seaport restaurants for fright night bites and sips. Don your costume and head downtown on Friday, October 28th to start the festivities at Tamo. From there, you can hop on a duck boat for stops at spots like Temazcal, Legal Test Kitchen, Outlook at the Envoy and Sapore, among others. At each venue you’ll enjoy spooky cocktails, apps and treats, and maybe even pick up a costume prize. The trick-or-treating goes from 7:00-10:00pm and tickets are $10 each online here, in support of Friends of the Fort Point Channel.