If you are planning a party or event for over 100 people and you want the day to go absolutly as planned then I would always recommend contacting an events planning company. Planning an event leaves the hard work of organising food, drinks and entertainment and lets you concentrate on getting ready for the big day.
You may want a live band or act of some kind or maybe a hire a chocolate fountain. Chocolate fountains are fantastic treat for any party or event and for any number of people. They creat a place to chat and unwind while enjoying smooth chocolate straight from the fountain.