I agree with Maryz , but if your confidence has been shot to the ground, are you going to go up and talk to strangers?
I met mums by seeing who DD came out of school with, who she talked about at home etc. Then saw which mum belonged to each child. That way when you're waiting at the gate you can say, hi are you xxxx mum, my d is xxx and she talks about her all the time, I suppose she told you about, playtime, lunch, pe, etc