I did once. Had a 4 week gig in Florence SC at a Holiday Inn with a big club that had rock bands. Good sized stage, big bar giant dancefloor, etc. First night about 3-4 song into the first set, a note from the manager saying to turn down. We turned down a bit, and continued, soon, another note. after 2 more notes we're playing at what I call toy volume. Crowd is not impressed with us at all. Many leave and go to the competition bar. Very next night, the manager that was telling us to turn down, had some medical thing and she was hospitalized for 3 weeks. We turned right back up. Nobody complained at all. By the weekend, we were packing the house every night of the week, and that continued for 3 weeks. Then she came back to work, and did the same thing she did the first night, so again we complied, and her full house dwindled to nothing. Next note was 'Turn back up' LOL We did and the crowd returned, and hopefully she learned how to run a dance club. BTW, this was 1973. It never happened again.