What was the name of the fictional high school attended by Charlene "Cha Cha" DiGregorio, Danny, and Sandy in Grease? 
Annette Charles: Annette Charles (born Annette Cardona; March 5, 1948 – August 3, 2011) was an American actress best known for her role as Charlene "Cha Cha" DiGregorio in the 1978 feature film "Grease".
i don't know