I'd forgotten something - you meet the most people between about 10pm and 1am.
That's when people are relaxed enough to chat, but not too smashed.
This was written in stone when I was in my 20s, but some time in my mid 30s I forgot it.
Usually, I go out on a Friday night after work, and run out of steam about 10pm.
This means I never meet anyone other than my immediate circle - everyone is catching up with friends, chatting to workmates, or getting dinner.