Commonwealth Day is not a widely marked day in many parts of Canada. Federal government regulations stipulate that the Royal Union Flag, or Union Jack, should be flown alongside the national flag of Canada on or at government buildings and premises, such as federal buildings, military bases and airports. The Royal Union Flag should only be flown from sunrise to sunset and where physical arrangements allow. In practical terms, this means that there should be at least two flag poles. The Royal Union Flag should not replace the Canadian flag if there is only one flag pole. In some years, particular communities mark Commonwealth Day with receptions or exhibitions.