During this two-day retreat, student-musicians have been working to hone the fine details of their MSBOA Band Festival Music (the 8th-12th grade bands are attending festival is at Jenison HS on Friday, Feb. 28). In addition, the 8th-12th grade band members are learning two brand new pieces during the retreat that will only be performed at the mini-concert at the end of the retreat tonight. The mini-concert starts at 7 p.m. in the HHS PAC Auditorium.