As they prepare for this year’s Veterans Day ceremony, town officials are asking Stoneham students in grades 7 to 12 to write an essay explaining why they are grateful to the men and women who serve our nation. The author of the winning essay will be asked to read it at the ceremony, scheduled to take place at 10:30 a.m. Nov. 11 in Town Hall, 35 Central St. To be considered, essays must be submitted by Monday. They may be e-mailed to the town’s veterans services agent, Jim Devlin, at firstname.lastname@example.org. Town officials also plan to dedicate nine World War I service medals to members of the military who had never received them. Following the ceremony, the medals, which are dated from 1917 to 1919, will be on permanent display at Town Hall.