The four remaining Division III boys basketball teams from the Defiance six-county area still alive on the tournament trail, will converge on Napoleon High School's "Grand Canyon" on Thursday night for district semifinal action.In the district opener, Ottawa-Glandorf (19-3) will face Evergreen (17-5) at 6:15 p.m., while Archbold (17-4) will battle Tinora (19-5) in the semifinal nightcap.