The head brewmaster for Surley is the guitarist for the late 80's/early 90's thrash metal band Powermad (
Powermad Myspace ). They recently played their first show in the US in ~15 years for the Darkness party at the brewery. Good times.
I'll try to give him a call to see if he can let me know of any close places that have Darkness on tap. I thought that I heard that the Happy Gnome (1-2 miles from venue) has it on tap.