Sounds like chaos is in the air. The Genesis Order of Druids and the Dolmen Grove both bill their events as sunrise on 22 December. Both announced in the last couple of days. I will dig some more.

P.S. It was around 2,000 in attendance last year. Compared to 300+ at the equinoxes and 35,000+ at Summer Solstice. So saying 100+ is a bit far off the mark. Last year the police were appealing for people to stay away, with cars parked on the main road, way down from the monument site.