October slots open at the end of September
I opened the September slots at the end of August, and they are all taken. The next ones, for October, will open at the end of September.
People on the mailing list hear about every new batch of slots first. I send the email before the slots appear on Booksy. I also send an email about single slots that free up during the month. If you would like to be first in line, sign up using the notification form.