I Own A Small Business. How Do I Sponser Local Nightlife Events To Help Promote It?

I’m starting up an online retail apparel company offering stylish clothing options to career women. Right now I am working out my marketing plan. One part of the plan is to sponser events for professionals, like happy hours and sexy singles meet-and-greets for professionals in the Atlanta, Ga metro area and other major markets. Where do I begin, who do I need to know and how to I get the ball rolling?