Day of Unity, commonly referred to as the Day 300 celebrations, is the annual recognition of founding of the Tion Hegemony and the unification of the Tion Cluster on Day 300 of Year 9. 

Each year, celebrations abound on all Tionese planets to commemorate the heros of Nikklon Mining, those who fought the New Anzat Order from the Cluster, freeing her citizens to live under better laws. Laws that were established by the Hegemony from the administration of Nikklon Mining.