On Tuesday, Michelle Obama, took to her Twitter to post a throwback photo of her prom night challenging individuals to join in on the #PromChallenge, an effort centered around encouraging others to post their prom photos and spreading the word to teachers and students to register to vote.

The Prom Challenge is a part of Michelle Obama’s When We All Vote campaign, a nonprofit centered around increasing voter participation and closing the race and age voting gap by changing the culture around voting. The former First Lady serves as co-chair alongside Janelle Monáe, Chris Paul, Shonda Rhimes, Kerry Washington, and Tracee Ellis Ross.

When We All Vote also shared how joining the challenge could win a high school up to $5,000 in a caption on their Instagram.

“Join our co-chair @MichelleObama by showing us your own prom photo to get the word out to students and teachers about our #PromChallenge with @MTV! Tell us how you’re registering students to vote and your high school could receive up to $5,000 for an epic prom ???Click the link in our bio to learn more and submit your application by March 13th.”

Check out other celebs who joined the challenge and encouraged voter registration below:

Click here for more information about how you can take part in the When We All Vote movement.