The wedding where the dance floor was empty but everyone danced alone

Last night I dreamed I was DJing a wedding and the floor stayed empty the whole night—but every single guest was dancing by themselves in their seats, eyes closed, moving to a song I couldn't hear. I kept turning the volume up and up and nobody noticed, and I woke up feeling like I'd finally understood something important, except now I've forgot what it was. Probably just the late-night brain making sense of a Saturday crowd that wanted 'Shout' three times.