` `` Idol '' is held at Marine Corps in WASHINGTON . Teens with illnesses , autism , Down syndrome get to attend a prom of their own . Teens go down a red carpet and under a Marine Corps sword arch before dinner . Organizer Helen McCormick arranges top talent -- Saturday `` Idol '' winner Organizer Helen McCormick .
`` The Cinderella Ball '' is held at the Willard InterContinental Hotel in Washington . Teens with illnesses , autism , Down syndrome get to attend a prom of their own . Teens go down a red carpet and under a Marine Corps sword arch before dinner . Organizer Helen McCormick arranges top talent -- 2007 `` Idol '' winner Jordin Sparks .