8. DJ, please stop the music.
I've heard complaints about weddings where the thump-thumping of techno music began the second that the couple walked through the door and didn't end until the cake-cutting. (Grandma was afraid to step foot on the dance floor, lest she get clocked in the head by a stray fist pump.) At another wedding, the music was so loud that my mom escaped to the bathroom to rest her pounding head, only to find a group of other guests camped out there for the same reason.
How to deal: During your cocktail hour and dinner, play music that's low enough so that guests can hear each other without having to scream. Pump up the volume when it's appropriate, and don't seat any elderly guests right next to the speakers. Conversely, nothing is more awkward than being at a wedding where no one wants to get up and dance. If a song or genre just isn't working, ask your band or DJ to switch gears. Have fun with it.
Photo Credit: Viera Photographics