Instead of backpacks full of books, some students at Great Bend High School were seen carrying work boots into the school Wednesday morning. The entire GBHS population – about 900 teenagers as well as their teachers – was invited to take part in the school’s fourth annual Community Service Day.After checking in with their advisers, everyone headed to the gymnasium for an assembly. There would be videos and kudos for ongoing projects, and an original song performed by Emilynn Wettengel before students boarded buses and headed to their first assignments of the day.Ashley Durland, a senior in Sergio Rameriz’s art class, said her group was helping the Convention and Visitors Bureau.“We are going to the Events Center to fill goodie bags,” she said.