From the "Strathspey Mailing List" on Tue, 3 Jan 2012 (message 62176):

I have "The Anniversary Book" in front of me and, sadly, can
find no clue to the nature of the anniversary.  Not even a
date!

As you know the dances are by Joseph Killeen, who I know was
active in Carlisle in the early 70s.  Music is by Nancy
Dickson and Donald C Ridley and the publisher was Carlisle
RSCDS whose secretary was Mrs C Ridley.
