Just one publishing lunch anecdote.
Ken Russell, the film director, wanted to write an SF novel - this was around 1996, when I was editorial director of the SF imprint at Random House in London. So Ken got in touch with me and I said 'Let's have lunch and discuss it.' I took him to a French restaurant called La Poule au Pot, in Pimlico, which some of us from RH used at least a couple of times a month. For about half-an-hour after we sat down, Ken was frowning, and I wondered what I'd done wrong. Then he explained that he'd recognised the restaurant, but couldn't think why - until it dawned on him it was the place he'd taken Twiggy and Justin de Villneuve for dinner on the opening night of his film THE BOYFRIEND, in which Twigs had starred!
We talked about his novel for about an hour, then moved on to films, naturally enough. I truly love films, so we had lots to discuss and discovered we are both huge fans of Powell and Pressburger, whose oeuvre took up the second bottle of house red. Eventually, I poured him into a cab to wend his way back to the station, and returned to the office.
We didn't publish the book - I had various editorial suggestions, but he wanted to keep his own vision. Someone else in London did publish it, but I don't think it set the world alight. But that's the sort of moment that makes publishing wonderful!