Harlem United kicked off its “Let’s Do It” HIV testing and education campaign Saturday, June 25, at Fort Greene Fest, a daylong celebration of the Fort Greene and Clinton Hill communities in Brooklyn.

Boardwalk Empire actor Michael K. William was slated to promote HIV testing and education at the festival, but he was held on set. Rosie Perez filled in for the day’s festivities. William still plans to run the ING NYC Marathon later this year with the Harlem United Community AIDS Center’s running team, raising money and awareness for Harlem United in the process.

Harlem United provided free HIV/STI testing from 1 to 7 P.M. at the festival.