Towson, Md. ? Some Muslim parents, students and activists are lobbying for Baltimore County’s school board to cancel classes on their two chief holidays.

If the schools are closed for Christmas and the Jewish High Holy Days, the group argues, it’s only fair to add Eid al-Fitr and Eid al-Adha. But opponents are wary of adding too many holidays to the school calendar.

“Our students are already inundated with enough time off,” said Ella White Campbell, who chairs the district’s minority advisory council. “It sets a very dangerous precedent.”

Under a lunar calendar, Muslim dates shift backward each year. Also, exact dates cannot be scheduled in advance because religious authorities must recognize moon sightings made by the naked eye.