There are studies that show obesity is contagious. If your best friend gets fat, your chances of getting fat more than double. I don’t know for sure, but I assume the same thing is true for smoking cigarettes or drinking too much.
What I learned working at a kid’s camp is that the most important thing you can do is choose who you hang out with and who influences you. The second most important thing you can do is put dynamics in place that reinforce the ideas you’d like to see spread.
Celebrate the heroes. Make it easy for those ideas to spread.
I guess if I were looking to host a dinner with some clients, I’d choose heroes with great ideas to sit around the table, making everyone a little better.