Here a few links that may be of interest.
New links can be added, please let me know.

Information-websites

Kenneth Sparrs homepage
Early romantic 19th century guitar information home page
Classical guitar homepage in Japan
Worldguitarist.com
Arto Wiklas music page
Guitaromanie homepage
Yamaguchi guitar society

Festivals

Rotenburg
Iserlohn
Darwin
Mikulov
Remscheid

Others

Rodgers tuning machines
Gut string making