What is Sashiko this is a compilation of postings (a bit long) from the QUILTNET site. It has a very interesting history of the technique, a section explaining some of the designs and information about the fabric.

Japanese Happi Coats gives you a brief introduction to the common festival coats used at every Japanese festival.

Festival Arts in Japan is a very informative book review that will answer your basic questions about modern Japanese festivals.

Top 12 Summer Matsuri of Japan links to the English language web sites of twelve festivals. Some have wonderful illustrations and articles on the history of the festival.