In my family it would be no problem, as cousins are rarely ever invited to each other's wedding. I had a cousin and his wife killed last year, only about a year after they got married. It's sad I wasn't at their wedding, as that was one of the last times our family would have been together with them.

With that being said, I have to agree with Iceman. I don't think a cousin is that close of a relation that you should feel guilty about going to something you really enjoy, versus a boring family wedding. I've had 3 nieces get married in the last 2 years. One wedding my daughter wasn't at; the second wedding I had 2 nieces who didn't attend, and this last wedding a couple weeks ago another of my niece's didn't attend. My nieces and nephews have always been somewhat close, yet half of them didn't go to the other's weddings. If Bon Jovi or The Nationals were in town when a relative of mine got married....I'd just send a nice gift.