@Carrie225 I think it highly depends on the local attraction and your location.
For us, we actually do take advantage of the Holiday season. We also raised the pricing on NY eve because we think people will love the convenience to be able to walk to attractions, and not to worry about drunk driving, plus we anticipate a bit more of a mess from NY eve guests. Next year we think we will be taking advantage of the wedding season Spring-Fall (we're quite new, didn't realize we would have a lot of wedding booking this year).
I guess you just have to look at the trend in your area and compare those prices/location against yours.