The GSRC and MuSyc sites have themes associated with
posters.  The CHESS and Embedded sites do not.

I ended up editing

~/src_testrelease3/javapages/embedded/gsrc/workshop/config.properties

and, after installation:

~www/java/embedded/WEB-INF/classes/gsrc/workshop/config.properties

I'm not sure why the second edit was necessary.