Denise Hemphill (Niecy Nash) mentions the tv show Quantico. The main character in that show is Priyanka Chopra. In 2018 she married Nick Jonas who played the significant role of Boone in season 1 of Scream Queens.
The characters get dressed up for the party to lure the killer into a trap. Here's a list of the person and their costume: Chanel (Emma Roberts): Smurfette Chanel #3 (Billie Lourd): Death Chanel #5 (Abigail Breslin): Ivana Trump Zayday (Keke Palmer): Isis Denise (Niecy Nash): Khaleesi Daenerys Targaryen Chamberlain (James Earl): Mario Cassidy (Taylor Lautner): Ryan Lochte Dean Munsch (Jamie Lee Curtis): Alexander Hamilton Brock Holt (John Stamos): Batman v Superman's Script Hester (Lea Michele): Ivanka Trump (was given a Jason Voorhees costume)Multiple Unamed Patients: Hamilton/Lin-Manuel Miranda/Snow White.