The auditorium in the northwest Bronx was speckled with balloons. Balloons that said, “Congrats Grad!” and “You’re so special!” Balloons arranged on stage in columns of white, blue and yellow. Balloons in the shape of champagne bottles. And a parade of shiny floating letters that spelled out “Graduate of 2017.”

Nearly 60 teenagers accepted diplomas from Bronx Preparatory High School there on Monday, amid all the usual trappings of a graduation ceremony. But for three men in their 40s who joined the teenagers onstage, wearing the same blue academic robes, the day was no less meaningful.

They were Yusef Salaam, Kevin Richardson and Raymond Santana Jr., three members of the Central Park Five. Years ago, they missed the graduation ceremonies for their own high schools because they were in prison for a crime they did not commit.

On Monday, they received honorary diplomas and the capped, gowned feting they had been denied.

“Even though we were not able to go back and right the wrong of not getting our high school diplomas outside, here we are being honored in such a way in front of our family and friends,” Mr. Salaam said from the stage, smiling broadly. “This is a blessing.”