Two kids in tow, I started with a promise. For every artist I stopped to talk to, I would give the kids $1 in treats at the end of our trek. At the start this applied only to artists I already knew. We modded the rules quickly to include conversations of 5 mintues or longer with new connections.
By 5 PM, I was buying the kids supper. It was well worth it. I collected many conversations, and formiddable stack of business cards too.