Hi John as far as I can recall there has never been a BVWS meet in Wales the current and future meets can be seen here
https://www.bvws.org.uk/events/diary.php
There have been meets in various areas in the past and the BVWS have in the past been very supportive of these local meets but they are a huge amount of work the bulk of which falls upon the organiser so you need to be sure you will get enough support
Cheers
Mike T