I remember the weddings I attended as a child as being amazing, far more than the ones I have attended as an adult. One in particular, I attended with my grandparents (my younger brother was born around then, probably that was why parents didn’t go, as their contemporaries among the relatives were all there). I had desperately wanted to be a bridesmaid, but was too biddable a child to have kicked up any sort of fuss about it. The lovely bride, my Aunty (mum’s cousin) made sure all the kiddies who were not bridesmaids or best boys had a tiny posy and a horseshoe to hand to the couple and all were in a picture. I don’t remember any children running riot, but then I was a child myself and wouldn’t have noticed, but we just didn’t in those days or there would have been ructions.
At our own wedding 40 years ago, there were several family children who behaved beautifully, heavily outnumbered by their parents and grandparents. But a work colleague of DH and his wife, who I had not met, turned up with their (uninvited) nephew, saying “Hope you don’t mind”, what could we say. He had to be found an extra seat, and was extremely badly behaved! I seem to remember a couple of guests were taken ill at the last minute and couldn’t attend, but after the cut-off date to give the venue the numbers so we were charged for them anyway, but they had removed their seats - then charged us extra for the unexpected kiddy!