Happy Sai Rayanna Day!

 This is a later addition to the Calendar, seen only in Aristasian/Chelouranyan sources. Sai Rayanna (sai being an honourific title) is a legendary figure, described as a great warrior queen who defeats a great host of demons and establishes the holy Caeran Empire (see the ECE, pages 243-244).

The creation of this Myth and its inclusion on the Calendar has much to do with the worldbuilding the Aristasians indulged in. They envisioned another world on a different plane of existence, mapped its regions and the differences between them (down to the trendy haircuts and fashions each region preferred), and detailed a history of the Holy Caeran Empire, later the Nevcaeran Empire (New Caeran Empire). It is the founding of the original Caeran Empire that marks 'year zero' in the calendar date the Aristasians used, known as the Imperial Era (see this page on other year dates Filianic sources use).

I don't know to what extent the original creators of these stories believed them to be true, or if they expected others to genuinely believe them as true (which also gets into an aspect of truth in myth that Aristasians had unique views on). The story of Sai Rayanna's defeat of demonic forces was patterned very intentionally on the story of the Hindu Goddess Durga's defeat of demonic forces, and may have been seen as recapturing the essence of the story in a Filianic way. I haven't brought up this holiday much before as I feel it could be taken badly out of context very easily, but as this is intrinsically tied up in the year date that I have used from the beginning, I felt it should make its appearance at least once!

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For more on Aristasia and the history of Filianism as a whole, see the Critical Apparatus at the back of the Eastminster Critical Edition of the Clear Recital (ECE), 4th edition (page 336 and on deal with the creation of Aristasia and later movements, including Chelouranya; see also page 243-244 for the entry on Sai Rayanna's Day).
 https://silverscripture.blogspot.com/p/scriptures.html

The Chapel of Our Mother God on Sai Rayanna:
 http://www.mother-god.com/warrior-queen.html