Here are some websites I have found that send coupons for free meals/treats for your birthday. Some of them have fairly short times to use the coupons. Some of these you can sign up adults & kids.
FYI - I have 2 e-mails I use. One for personal e-mails & 1 for all of the deals I get e-mailed. It helps me keep everything separate & not get overwhelmed as much.
Cold Stone Creamery
Toys R Us
Red Robin - other deals besides birthdays also
Red Lobster - other deals besides birthdays also
Dairy Queen - other deals besides birthdays also
Macaroni Grill - other deals besides birthdays also
Applebee's - some have postcards you fill out at the restaurant