Can someone help me find a place for my dinner party?

Im turning 16 in April and I want to have a dinner party, unlike my friends who had theirs at Chili's & Apple Bee's I want mine to be downtown atlanta or somewhere close. I will have a party of 35-50 people and I want it to be beautiful & elegant, without a theme if its a restaurant, somewhere I can allow my own catering and also something that fits a formal kind of setting. Somewhere not TOO pricey but it can be lengthy I am turning 16 (; it would be nice if I could get some help ! Thanks .