Architectural Conservancy of Ontario Hamilton Region Branch Membership Information Joining the Architectural Conservancy of Ontario through the Hamilton Region Branch puts you in touch not only with Hamilton events but with activities across the province through the ACO's tri-annual newsletter, the ACORN. Additional activities include house and walking tours, publications, public lectures and advocacy. We invite you to join with architectural conservationists and naturalists throughout the Hamilton Region and across the province. Become a member today. To become a member please download and complete the attached form and mail it along with your membership fee to the address shown. To be included in our annual information mailing list please e-mail your name and address to acomembership@architecturehamilton.com Thank you for supporting Hamilton's Architectural Heritage.