Scottish dancing every week in Linlithgow:

http://john.m.sturrock.users.btopenworld.com/jul-sep07.htm

and a session on the third Sunday of the month:

http://www.angelfire.com/music2/linlithgowfolkfest/SessionList.html

You need to get to the Union Canal first, of course...

Anything on the Crinan Canal?