From the Evergreen State Fair last August in Washington state (USA).
I knew exactly what I was after. Worked out the composition in advance a couple of hours earlier, staked out the spot, then returned later and waited until closing when the place was nearly empty and they began to turn out the lights. I then approached the teenage boy, explained what I was after, and requested permission. "What should I do?" he asked. "Just stand there exactly the way you were when I first walked up," I replied. "OK..."
Afterwards I thanked him, gave him my email address, and said to give me about 2-3 weeks and I'd send him a scan or print if he wanted one. He never contacted me.