In Vegas any dates with triple digits are popular. I suggest booking as early as possible. I was part of the 7/7/7 madness! Can't say for sure that your date will be like that, but things filled up quickly. People were pretty much herded like cattle! Ceremonies are cut shorter than they already are, and not much time is allowed for photos.
The chapels and the casinos are the worst! Try to find a more private venue if possible. I've been based out of Vegas for the past 3 years and have pretty much seen it all!
Good Luck!