Generally I end up trying to play the situation to give me an approachable disposition in their eyes, when having a one on one conversation it tends to get to be a very tricky environment for me so I try to approach a conversing group and that usually gives me ample time to observe the nature & frequency of their attention checks, it's a bit of a game and dependent on the individual but it is one system that I try to refine and employ.
Of course the groups I approach are filtered, after a fashion. Ranging from temperament of the group to familiarity with number of people within that group. Which leaves me with a broad base to chose friends form new environments with a loose "support group" to return to when everyone just gets too much. Currently studying so this tends to be one of the the international student groups.
Groups tend to be manageable for me, dependent on its makeup. But they are always daunting to me. Even crowds, if roughly 20 people or more are assembled to do something that is not really constructive it makes me worried because of group thought. Then the larger crowds of hundreds just slowly drive my mind to shards, attempting to concoct a contingency plan at that point is a bit too difficult for me.
But yeah, eye contact. enough to embed into the minds of agressive/manipulative/ambitious poeple that I watch with both eyes and their shenanigans are unappreciated. Usually delivered with one of those responses that indicate underlying reasoning will prevent me from ever engaging or enjoying similar activities, it seems to work more often than not. Then with other people it slowly goes through stages untill I try to endear myself to them. Still rewriting my conventions in this area as embarrasing situations have ensued, bit more cautious now.
As far as socialising goes it is a chore for me to wade through all the personalities to find people who could appreciate that the harmless characteristics are harmless.