As indicated in Ohio University’s Policy and Procedure #41.125, University Human Resources annually issues an official list of holiday observance dates. The annual holiday memo [PDF] lists the specific dates that Ohio University observes these holidays.
The 2020 memo also addresses the mandated furlough days for FY 2021.
Please note that Winter Break Closure (WBC) is not considered holiday leave. Refer to policy #41.001, Vacation and Winter Closure Time for Administrative and Classified Employees for details.