I was at an event yesterday, flying with a few drone businesses. Drones were being sold at the event, and I guess we were there to spark an interest in people buying them. We just asked people when we were taking off and landing, if they could keep back a ways, until the drone was far off or landed with motors shut down. Everyone was cool with it. Kids running around without someone keeping an eye on them, and not knowing the danger of a prop strike, is what we focused on. As far as rules, I've heard we need to keep at least 25ft from people. But, I've also heard 100ft. On one landing yesterday, kids couldn't hear me warning them, so I walked off about 50ft from where they were playing, to land. Some people catch their drone in the air, then turn off the motors