I love a good wedding, as long as it's not my own...! THANK YOU AND GOOD NIGHT
Seriously though, I love weddings. What's not to like? At least if you're a guest with no responsibilities like holding a speech (I spoke, and DJed, at my sister's wedding). Ideally, and I've found this to be the case with all weddings I've attended, it's a declaration of love between two people you probably know and like, there's awesome food, plenty of booze, lots of happy people, lots of music (sometimes shitty, sometimes not). And it's often in the summer. Maybe I've just been lucky.
The whole ceremonial aspects of weddings, that's a whole other can of worms. I see TremblingEagle's POV. I'm not a religious guy at all, so I prefer a non-religious ceremony, but whatever rocks that particular couple's boat.
As for bachelor parties, I could tell you some stories that will make you want to murder every human being in the world.