Holidays Work Schedules and Pay – OPM.gov

Federal employees in the Washington, DC, area are entitled to a holiday on the day a President is inaugurated on January 20th (except as explained below) for each fourth year after 1965 (see 5 U.S.C. 6103(c)) (i.e., following a Presidential election)—if they would be otherwise scheduled to work on Inauguration Day within the “Inauguration Day …

https://www.opm.gov/policy-data-oversight/pay-leave/pay-administration/fact-sheets/holidays-work-schedules-and-pay