I am a graduate student and recently my school held a networking event for the students to meet with companies and expand their professional network. I am studying finance and will be looking for work in the financial services industry, where professionalism is held with high regard. At this event, alcohol (beer + wine) plus light refreshments were available as a method to lighten / loosen the atmosphere and the students. Many of my fellow peers and even some employers were drinking but due to reasons of professionalism, I choose to abstain. 

My question is would employers have any negative reactions from me not drinking as a sign of not fitting the environment or would they be impressed by the professionalism shown by abstaining? 

Although this was an informal event right before the holidays, I still want to remain professional to the highest degree. 

Thanks for any feedback.