Dear __________,
Your summer BBQs are always such fun events! The food, drink, and music were simply fabulous, and you have such a wonderful group of friends. It was so enjoyable spending the afternoon with you and all of them, mingling, talking, and laughing. Everyone had a marvelous time, and we’re looking forward to getting together with you again soon. And I’ll give you a call next week to share my secret potato salad recipe.
(YOUR NAME HERE)