Masks optional at Cedar Grove-Belgium schools The Cedar Grove-Belgium School District made masks optional with five weeks remaining in the school year. CEDAR GROVE, Wis. - Several Wisconsin school districts are taking on the mask debate in the classroom. The Cedar Grove-Belgium School District made it optional starting Monday, May 3 with five weeks remaining in the school year. "Concerns are real, and fears are real and nobody has gone through something like this before," said Superintendent Chad Brakke. Still, the school board approved making masks optional for students in 4K to high school seniors. Brakke said a community survey overwhelmingly supported the change listing a variety of reasons.