If you have spent any part of your life reading the classics, you have read about Michaelmas. Or perhaps you celebrate it now in your own observances. I myself was introduced to it through multiple readings of Jane Austen and others, but it appears often in Austen's works and I remember when I was younger and sans internet wondering what it was.
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.