I have friends who tell me about laser art events! Illuminate's Grace Windows (illuminate.org) returned, and this time I was able to experience it!
It was LOVELY. The room was lit only by (electric) candles on the floor and at the walls, plus light streaming in from the lasers. It took a while to realize how FULL the room was, and to ensure I didn't step on anyone, or sit on someone sitting in the very dark pews.
By the time the sun set, I was ready for bed, but I'm very happy with the experience.
It was a delightful experience.