Time Out says
Young artists from throughout Chicago take the spotlight at YAS! Fest, a one-day event in Millennium Park that showcases local performers and creators. Throughout the day, you'll be able to see youth orchestras and choirs, artworks creates by Chicago youth, local dance troupes and winners of the Chicago Park District’s Teens In the Park contest. The evening will conclude with a concert in Pritzker Pavilion, headlined by rapper Desiigner (best know for his hit, "Panda") and local R&B singer Ravyn Lenae, who graduated from the Chicago High School for the Arts. It's all free and open to the public—yas!