Slight cross-post from the Holy Magic Feedback forum, but slightly different. In my research on that post, I discovered that it looks like a few of the Holy Weeks are misidentified on Elanthipedia: https://elanthipedia.play.net/mediawiki/index.php/Holidays

There is not even spacing for all of the holy weeks and when you sit down and align the days listed on Elanthipedia and the weeks of the Elanthian calendar, you get a slight misalignment for a few of the weeks: The Holy Week of Hav'roth, the Holy Week of Chadatru, and the Holy Week of Fanella.

If those dates are right though, you get these gaps between the holy weeks:

Between Divyaush & Hodierna: 40 days
Between Hodierna & Everlid: 40 days
Between Everlid & Truffenyi: 52 days
Between Everlid & Hav'roth: 26 days
Between Hav'roth & Eluned: 42 days
Between Eluned & Chadatru: 22 days
Between Chadatru & Glythtide: 58 days
Between Glythtide & Faenella: 34 days
Between Faenella & Tamsine: 42 days

Based on comments about the nature of Holy mana, it fluctuates with the holidays. But how? If you're in the middle of one of the larger gaps, is there less Holy mana than if you were in the middle of one of the shorter gaps? Do the holidays stack, so that when you're at the end and start of the year and have three Holy Weeks back to back there's more than usual?