Welcome to the Blue Bird Audubon Society. As a new member of our Chapter, we hope to serve you in many ways.Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. Serve Washington created this packet based on input from past AmeriCorps members, program staff and supporters about what resources are the most valuable for a. A "thank you for joining" membership letter should include a personalized greeting to the new member. Use the member's first name in your salutation. 1. Enter the date at the top of the letter. Dear Parents: As your children begin sixth grade, I am writing to welcome your families to my class and to introduce myself.