Planning My Boyfriend`s Niece`s Confirmation

My boyfriend asked me a couple days ago, to plan his niece`s confirmation party at his house in 6 weeks. He intends for me to work with a caterer that he`s already chosen, but how do I go about making sure I am covering all my bases?
This will also be my first introduction to his family - there will be about 45 relatives that I have not met!!
Please help!
Posted by Julee; updated 04/04/04