I think that, perhaps perversely-seeming, the solstice's main significance is solar. cf well-known other Solar religions, such as that of Invictus Sol, and Jesus H. Christ...
In Dara Happan terms, the WS is the point at which Yelm reaches the deepest, blackest part of Hell, goes stark raving bonkers, and becomes Illuminated, and reborn thereby. So I'd suggest it was certainly a "Seasonal" holy day of Yelm, and one could be faux-clever and suggest it was the HHD of some "aspect" of Yelm, or related entity. (Bijiif? Rashoran?)
Slan,
Alex.
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