Rockin Hill Band to perform at Gregory Park Performances in the Park are free and open to the public. People who attend may bring a lawn chair or blanket and enjoy the music. Written By: Brainerd Dispatch | × Rockin Hill Band will perform at 7 p.m. Thursday, July 29, in Gregory Park as part of the Performances in the Park series. The series is a collaboration between Brainerd Parks and Recreation Department and The Center. Submitted Photo Performances in the Park presents Rockin Hill Band at 7 p.m. Thursday, July 29, in Gregory Park in Brainerd. Rockin Hill Band are musicians from the Brainerd and St. Cloud area who perform blues, jazz and rock.