I organized a major ACM CS conference this year. Some thoughts .. you need to be super proactive. A super keen person would read the specific papers from before and ask insightful questions during Q/A. State your name and affiliation. Hear other people asking great questions and engage in discussions with them. If there is a conference networking app or coffee break session, make an effort to participate. In networking, best thing is to be interesting (technically) .. have some of your own original ideas/opinions or projects to discuss. Good luck!