Jem Aswad Senior Music EditorResorts World Las Vegas has been making big comeback plans in recent weeks, announcing summer residencies for Zedd and Tiesto at its nightclubs — and it is apparently ramping up those plans significantly with the release of an elaborate video starring Katy Perry, Celine Dion, Carrie Underwood, Luke Bryan as well as Zedd and Tiësto, suggesting that residencies by those artists are soon to come as well.No concrete details are provided beyond the hotel opening on June