Did you recently receive a wedding invitation that you don’t want to attend? People skip wedding receptions for lots of reasons!
Skipping a wedding ceremony and whether it’s rude typically boils down to how close you are to the bride or groom.
Respond to the invitation as early as possible. It’s much ruder if you back out of the wedding ceremony a day before the wedding..
It’s courteous to let them know why you can’t make it. But, of course, if you just don’t like the wedding ceremony and everything involved, tell them something that at least sounds valid.
Skipping a wedding ceremony will be a bigger deal to some than others. To ease the pain of missing their ceremony, make some kind gesture to make up for it.