This letter accepts a local businessperson's invitation to join the Chamber of Commerce.
1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
I'm delighted to accept your invitation to join the Boston Chamber of Commerce. At <Chamber event>.
I was very impressed by the group's professionalism, ideas and commitment to helping local businesses grow. After that experience joining the Chamber seemed to be a natural. I look forward to working with you and the other members to further the cause of business in Boston. I thank you for your solicitations and your help in finding out more about the Chamber. I'll see you at the meetings!
encl: <List of enclosed items goes here>