I found going to the department chair of my major was a good source. I was able to meet some of his contacts and start networking and my dept. chair knew of regional activities.
Lastly, look into getting an internship. When you're at a job, you're networking more naturally and even if you don't ultimately go down that path for a career, you'll have had the chance to get more of an understanding of that field and an expansive network is always good to have.