That's right - you're here for dinner

You arrive at a house.
Ring the doorbell.
A face that you recognise opens the door.
You say hello and enter the house.
You then see someone else so you introduce yourself.
The person who just opened the door looks at you blankly ...
and then clicks onto something and tells you the x (his wife) is in the kitchen.

You go into the kitchen and someone else is standing there as well as x.
You assume that they decided to invite some other people over for dinner as well ...
Then x admits - they'd forgotten you were coming ...
Y who answered the door recognised my voice but not my face (it was a work dinner) ...

So you have a pleasant dinner with great people who you barely know,
don't know how much of what you came to talk about is appropriate to say in present company.
Eventually, y asks you whether there was more to your visit and gives you an in to talk about the stuff you specifically want to talk about ...

A great, useful night - and fun ....
but a wierd situation to walk into with people you barely know.