In the sphere of "talks," I know TED puts a big round carpet on stage that you're supposed to stay on while speaking. More generally for "carpets on stage," I'

In the sphere of "talks," I know TED puts a big round carpet on stage that you're supposed to stay on while speaking. More generally for "carpets on stage," I've seen some smaller music venues and studios with carpets to make a nicer area for performers and to absorb unwanted sound (in the case of studios)