The past couple of years, the OKW meeting was in late November, but members may attend any of the meetings without regard to ownership.
We went to the BWV (even though we don't own there) meeting 2 years ago and enjoyed the experience. The meetings are not well attended by members, but are very informative. There is a "business" meeting- which is scripted and very quick, with no opportunity for member input- and a public meeting where members are encouraged to ask questions. The board members are very good about responding to questions and are available for a short while afterwards. If you go to the BWV meeting, there will be no OKW information provided (and vice versa)
You can register at the door, but advance registration is welcomed. I'd encourage everyone to attend if possible.
Enjoy!