Yeah, Magvel has Latona, and while I think her role might put her as the only emphasized saint, there's also the bit that Frelia, at least, is polytheistic. So, there's probably some kind of holiday going on there - I'm pretty sure I remember feasts, at the very least, being mentioned, and there's mention of balls and such for the royals. So, it makes sense, but it's hard to say with, as you said, the very scant canon.

/dorking