December 31, 2010, I am having my 40th Birthday Party. It is at a Hotel. I have invited 80 guests. The attire is formal. My guest is wearing black and I am wearing red. My theme is cocktails. My centerpieces are made up of different cocktail glasses. My questions are, what tables do I use and how many? I want my guests to mingle. I am serving finger foods and it will be set up buffet style. I have a DJ and I want people to have fun! Should I sit up a large banquet table in the middle for my table?