I confess to having a fear of an empty MMB, so we do tend to book VERY early ... it helps year-planning, and potential Gold renewal (OK, I’m sad).
We have NOTHING on the books for 2020/21 Membership year (starting May), just a bunch of stuff that will renew Gold (by Christmas 2019) and a couple of probables for May/Jun next year.
Life would be simpler if we hadn’t discovered FT and BAEC