A relative recently got married. Let's call her Sue. Apart from her immediate family, no other relations were invited. I didn't expect to be there and it's perfectly understandable to keep the number of guests down for reasons of cost.
But none of the rest of the family even knew that she was getting married, yet Sue had told mutual friends all about the wedding. We found out by accident when another relative met up with an acquaintance who asked her if she was looking forward to the wedding. I work with someone who Sue has known for a long time and she knows that this lady is a colleague. A few days after the wedding, I was asked how the big day had gone. Poor lady was absolutely mortified when I said that I hadn't been invited; nor had the rest of the family. Moreover we had only found out that it was happening by accident. It was so embarrassing!