Think about all those times when you just could not figure out what would make this party better. Now consider hiring a musician to come and perform. You could be going for a rock theme or classical. Whatever your choice is it could be what really throws your party over the top.
What better way to enjoy a night out then to go to a concert. It could be something as simple as going to see a single performer at the local club, or going to a large venue to see someone perform. It could just serve as a change of pace and allow you to explore other types of music.