Well, today is Michaelmas. If you celebrate, enjoy! If you don't and want to know more, there's a helpful entry on Wikipedia. Yes, it has been primarily a religious holiday, but it is also strongly associated with the autumnal equinox--which I neglected to post about last week--and is often observed along with that, too.
I also found this website helpful about Michaelmas where you can read about customs, history, etc. And yes, I count this as pertinent to SurLaLune as part of customs and traditions with associated folklore, albeit they are primarily religious traditions which have a heavy influence on folklore.