The Hygromanteia allocates the days in the middle of the lunar cycle to spirit working. This often, but not always, aligns with the Full Moon (this is because the moon cycle length does vary slightly throughout the year).
At the end of August, we have our second full moon, in Pisces, and this time well aligned for some particular spirit work. There’s a day for protecting against unwanted spirits, a day for ancestral workings, and the a day for expanding your circles (which you can approach in a mundane sense for making more friends, but also in a magical or witchy sense for connecting with new spirits).
So Public Service Announcement: just before the second full moon in August is a good time to do protection work to exorcise or banish unwanted spirit entities. And if you are planning on expanding your spirit posse on the day after, I highly recommend you do so.