From the Super Mario Wiki
The Hollywood Bowl is a large amphitheater that is located in Hollywood.
In The Adventures of Super Mario Bros. 3 episode Dadzilla, Big Mouth and Kootie Pie demanded for Madzilla to let them play their own private concert in the Hollywood Bowl immediately. Unable to deny their request, Madzilla went over to the Hollywood Bowl and ripped it out of the ground while a man was performing on a piano.
Madzilla then brought the Hollywood Bowl back to Big Mouth and Kootie Pie, and placed it around them so that they could perform their own proper concert. Big Mouth and Kootie Pie performed the song Stomp My Name on the Walk of Fame, although the entire crowd hated it and threw everything that they got their hands on at the Koopalings.