Jennifer Garner, Olivia Wilde, Dakota Fanning and more came out to support the cause.
The annual Dior-sponsored event will take place Nov. 15.
Unitas raised awareness and funds to fight human trafficking.
The New York-based charity will celebrate its 62nd anniversary at the event.
Copeland was on hand at the annual American Ballet Theater spring gala.
“It was a little different this year, because everything about this year is different,” Time magazine managing editor Nancy Gibbs said.
“I thought I was bringing my trainer from Dogpound,” said Cynthia Rowley.
Clinton came out for the annual School of American Ballet winter ball.
The awards gala honors emerging and established talents in theatre, film and dance.