DEAR MISS MANNERS: We have friends who seem to think every little milestone should be celebrated like a small wedding. They hold celebrations and attach a wish list, sometimes with hundreds of gift ideas, to every invitation. Birthday parties, gender-reveal parties, baby showers (for every child, often asking for a box of diapers as well as a gift), housewarming parties … it’s never-ending. Should I mention that a thank-you card is never issued?