Outside of the socials, the best bet in my opinion is the poster floor. I have met many people while just wandering the floor for hours and stopping at posters that are both in and out of my particular interest. Again, if you using the meeting planner can help you narrow down who the individuals in your field may be because this would help make sure you are on the floor at the same time. If you are like me and are a bit of an introvert, I “practice” talking to new people while at SfN by striking up conversations with relative strangers (Uber drivers, hotel workers, etc). This helps prime me to be in a more social state.