The first thing you'll want to do is make a guest list. Knowing how many people
to expect will help you determine where to have the party as well as how much
food and beverages will be required.
For example if your planning on having more than 100 people at your party and
you don't have a very big house, you'll need to seek out other places to hold the
party. This could be someone else's house, restaurant, club or perhaps a
catering hall. Also keep in mind when planning your guest list that your guest
will likely want to bring a date, so you need to factor that in to the number of
attendees you might expect.