Year Day (Intercalary preceding January 1)
Walpurgis (Intercalary following March 30)
Armstrong Day (Intercalary following June 30) [originally July 20]
Empire Day (Intercalary following September 30) [commemorates signing of Articles of Empire on 24 Nov 2153]
Yulestice (Intercalary following December 30) [originally December 21]