I have been a clown the whole time.
I'm an extrovert so I used to chat to everyone. Problem is, any guy with a bit more social calibration would know that not everyone ought to be talked to - they might be feeling uneasy that day or are naturally guarded. So, I need to calibrate.
Upon entering each event, do you,
A: Talk to everyone in the room, try to build rapport, make sure everyone knows you.
B: Pick out those who which there is a future with in the interaction and work solely on building a strong bridge with them. (e.g. hot girls even if just as friends for social proof or cool guys that you can exchange pointers or hang out together with)