Students from the Arabic Club at the public high school in the city of Medford, about a 15-minute drive north of downtown Boston, wanted to participate in “World Hijab Day” early this semester. The annual event was created in 2013 to promote awareness and understanding of Muslim women who wear the headscarf as an expression of their faith. At Medford High, the plan was pretty straightforward ... The date was set for February 1. But soon after Hijab Day was announced, the Medford public got wind of it. And there was a wave of phone messages, emails and social media...