ShowShowWitness: The Tour: PhiladelphiaOct 12, 2017Katy Perry, Noah CyrusXfinity Mobile Arena · Philadelphia, United StatesFollowI was thereUpload from this showMediaLineupAboutDateOct 12, 2017VenueXfinity Mobile Arena · Philadelphia, United StatesArtistsKaty Perry, Noah CyrusListingConfirmedShow details from MusicBrainz.