All very hypothetical and based on a dream I had last night 
I'm going to a concert this weekend, very cheesy band from way back. It will be fun, if not quality 
Anyway a couple of the group might not be able to go and I dreamt last night that I got chatting to some people at the bar in the pub beforehand and invited them to join us.
Then I wondered if I would actually do that in real life and what the likely reaction would be?