Dear Abby: Was it right to leave us out of the wedding dinner?

Dear Abby: We were invited to an out-of-town wedding along with some of our children. It cost several hundred dollars, including airfare, hotel, food and gifts. The events started Friday afternoon and lasted until Sunday evening. On the Saturday of that weekend, the bride’s family hosted a dinner and informed several of the wedding invitees that they were on their own for that evening. Was that appropriate? Should we say anything to the groom’s family with whom we are associated?