Always tricky things, parents evenings.
I tend to get the greetings over, say something like "Now then..." And launch into the pupils attainment levels. I swiftly follow this up with where their keys skills lie, how hard they work and suggest some areas that require work.
I then ask if the parent has any specific concerns (I don't want to hear a long rambling monologue about how much they love/hate my subject) and after that I start rustling paper officiously and saying how nice it was to meet them.
Usually works!
Mind you in Secondary it's maybe better for us as parents are aware they need to get going to the next one.
I have had SMT patrolling the corridor discreetly "following" a famously "difficult" parent on more than one occasion!