Have your wedding on a Sunday afternoon or even on a weeknight. The demand is way less for these days and you can get better rates and deals. I personally love Sunday weddings in the middle of the afternoons. It seems like there is always more attendance, too.
Wedding can be extremely expensive, but there are lots of ways to help keep the cost down if you have the time to do some research. One cost saving idea is finding a frugal location for the ceremony. Local parks are one possibility, weather permitting.