BIBOA is a national club, although its current activities do have a definite southern bias. However, club events only happen where someone is prepared to organise them. It's a catch 22 at the moment: few northern events, few northern members; few northern members, few northern events!
I would suggest that you join BIBOA (if you haven't already) and organise a cruise near you. It doesn't have to be anything particularly adventurous, and you can always ask for help from the committee (or here!).
Alternatively, pick a date a few weeks ahead and postsomething here and see what sort of response you get.