Whenever we go to the first parents' evening of a new school year, I'm thrown by the fact that DH, who isn't at school very often, shakes hands with the (usually female) teacher and introduces himself by name. After a brief hot flush of indecision, instinct usually leads me to do the same, because it would seem rude not to - though I'm never sure of the etiquette of women shaking hands with each other, and I've usually spoken to the teacher a couple of times in the playground previously anyway.
Is it just me that worries about this sort of thing? What do other parents do?