Crocheter & knitter,
Translator for HPMoR into Polish
Leader of Habitica's rationality guild, The Bayesian Conspiracy
You have omitted the fact that vitamin K2 is produced not just by bacteria fermenting our food before we eat it, but also by bacteria in our intestines. Have you researched this source of K2? Do you have any reason to believe intestinal flora does not produce enough K2?
At university I was taught that vitamin K deficiency is extremely rare due to its production by inestinal bacteria and that is why normally only newborns (who simply don't yet have gut bacteria) receive K2 supplementation.
Berlin location has been changed, but the space is still somewhat limited (date: 15th December). Contact Anne (Lachoutte?) if you really want to attend
Frankfurt definitely has a Solstice celebration, but I don't know the details.