Welcome back internet queens and kings. Usually, people are notified of important dates, like weddings, months in advance, sometimes a year. It's respectful and courteous to tell your guests well in advance about wedding dates, that is if you want them to come. If someone can't make it given the ample time of planning, it has to be on them. What if you didn't plan it? If something so crucial and important comes up at the same time as this long awaited wedding date?
This brings us to the Reddit thread. This woman has been planning her wedding for a very long time, ample enough time to plan around this one day of the year. It turns out that her younger brother got the internship of his dreams, and that the training week is in conjunction with her wedding day. He bails, but not only that. He expects her to change her entire schedule around his, after planning for years.