Take the total population of your market or listening area. Divide that number by 365. The result equals the average number of birthdays taking place in your market every day. Obviously, the actual number will be lower on some days, higher on others. But every day presents an opportunity to wish your listeners a Happy Birthday. It's easy to start a WXXX Birthday Club. Just have your listeners register via email or a form on your website, then give them some recognition on the air and online. The longer you do this, the more participation and interest you'll see.