Weddings are ceremonies that draw on hundreds of years of traditions, but they're also something deeply personal to the couple joining together. That means that it's entirely up to them as to how it's supposed to go down and whether any of these traditions matter to them.
But at the same time, there's enough of a commonality between them that most of us are aware of some basic etiquette when it comes to attending a wedding. And most of these conventions are followed in the interest of ensuring that nobody upstages the bride on her big day.
Granted, it is certainly possible for brides to take this expectation too far and force a list of unreasonable demands on her guests and bridesmaids. But if you were to ask everyone you know whether it's a good idea to propose at someone else's wedding or to wear a white dress to it, you can expect to catch a lot of horrified looks in response.
And a similar question has recently led one couple to reconsider everything.