A beautifully evocative reflection. Your framing of December 19 as a liminal threshold captures something essential in the Thelemic current—the way ritual time opens inward as much as outward. By invoking Hadit through Liber L, Cap. II, you highlight not merely a calendrical observance, but a living point of contact with the flame at the heart of consciousness itself, a theme deeply resonant in the work of Aleister Crowley.
The emphasis on feastal communion is especially apt: this is not withdrawal from the world, but an intensified participation in it, where self and cosmos are experienced as a single, ecstatic motion. Read in this light, December 19 becomes less a date to be marked and more a reminder—a call to renew alignment with one’s True Will through contemplative practice and inner attentiveness. Your summary conveys that invitation with clarity and poetic depth.