OPERATION HELLOECHO

Say hello to 100 people in one day.

WHY?

I just think it's a nice, harmless, fun idea.
I'm very interested to see what happens. Hopefully it'll be a conversation starter.
It could be a side-mission during another bigger mission.

POINTS

This is a simple caper but it generates many possibilities so 25 points will be awarded for completing the caper as well as bonus points if anything comes of a hello.