Why Join the Harwich Chamber of Commerce Why Join the Harwich Chamber of Commerce? We look forward to you being a part of “YOUR” Harwich Chamber of Commerce. Please call me at 508-430-1165 Posted in Arts and Culture, Business, Dining, Events, Harwich Happenings, Living in Harwich, Lodging and Vacation Rentals, Marketing, News and tagged Join Harwich Chamber of Commerce.