Oh I see! 😁Thanks for explaining.
It's funny, because it reminds me of an incident, back in the winter of 2004, when my (now late) mum turned 60, we had a surprise birthday party for her. I did all the invitations, and on the day there was a huge turnout. Of all the people in the room, there was only one lady I didn't recognise.
I asked my sister if she knew who she was, but we were mother sure we'd never seen her before.
By today's standards, I did an exceptionally daring and inappropriate thing - I went over to her, smiled, and thanked her so much for coming. Said woman was beaming, and said to me "Oh your mum's face when she walked it, what a picture, etc, etc, etc".
I said "Yes, she had no idea, bless. Forgive for asking, [ smile at the woman ], and I can't make this sound polite [ laugh ] , and I'm ever so sorry, but I can't place you at all...you are...?"
And she roared laughing, told me who she was (I knew then I had invited her, and no, I'd never met her before), and with that we both turned and got on with the rest of our lives.
It all seems so unsophisticated and quaint, when I look back. FFS.