Satanic Ritual difficult dates to pin down

For those of you who practice Gematria and want an idea of the importance of certain dates?
This isn't a complete list of ritualistic / celebratory dates, as (like I've often said previously) the religion the system follows, isn't Satanism, but a far older religious system. However many of the dates here, are based around that old religion, so it gives you a clearer idea, if that makes sense? Lol