Networking and mingling is an incredibly important way of gaining presence in the modern business world. By meeting and socializing with people you gain insight in to their personalities, and can learn their likes and dislikes. You can find out what no spreadsheet or earnings report can tell you about them… what they are like to deal with. A human touch, face time, all help in making you and your brand something more than just a list of statistics on a piece of paper.
At the same time that you are learning about them, they are learning about you, and the more remarkable you make your interaction, the more prominent you will be to them. It’s the same principal as a business card: stand out, be represented accurately and be memorable. Your conduct will determine whether or not you get that call or not.