Hire a magician. Rent an air jump castle. Hire a clown to pass out balloons. Hire a Santa Claus for your holiday party to pass out candy canes. Children and adults love these special additions.
Every party has to have food.
If you have finances for something extravagant, catering would be your best option. There are many catering businesses listed in your local phone book. If you do not want to go to that extreme, you can go to most any grocery store and in their deli or bakery section you will find many party platter selections. Make sure you check out your local restaurants and bars for their specialized party offerings too. If you are on a strict budget, it can work well to ask everyone to bring his or her favorite finger food.