Just interested to hear how others would handle this.
You are lined up at the post office. There is a woman in front of you with a baby in a pram and a young child. You realise you have met this lady once before, about 4 months ago. Her and her family know your DH as they have had social interaction a few times, however they've only seen you on one occasion.
You have doubts she'll remember who you are, as you were wearing sunnies at the time you met and you had a different hair colour to now.
Basically, you feel the chances of her recognising you - without actually being reminded of where you met previously - are slim.
When she finishes her transaction she moves off in another direction, so no eye contact is made.
The question - do you go out of your way to say hello and remind her that you know each other?