@ct_bergstrom i worked a farmers market for years selling baking. They were thieves at first in the morning setup period, and I had to chase them away. At end of market I would yell Crows! and break up a few croissant, danish, baguette - whatever was left over - and give it to them.
After 3 weeks, they never bothered me at opening again, and hung around in the neighboring trees waiting for me to call them for their treats at the end of the market.