I must have taken close to a hundred photos that day in the JWR museum – wow, what a collection.

The B.A.S.H. is the annual spring "central PA" TE/AE get-together. It is always a good time.
My understanding that it stands for Bring A Sunbeam Here. Someone with more history can correct it if needed. Back in the 70s it had "Fix-in" added with the name… people brought broken cars for fixing "on the spot" or so legend goes.
Here is the thread from the 2013 event with write-up and links to some pix:

Watch the forum and the Rootes Review for info on the 2014 version.