ShowShowWitness: The Tour: DetroitDec 6, 2017Katy Perry, Purity RingLittle Caesars Arena · Detroit, United StatesFollowI was thereUpload from this showMediaLineupAboutDateDec 6, 2017VenueLittle Caesars Arena · Detroit, United StatesArtistsKaty Perry, Purity RingListingConfirmedShow details from MusicBrainz.