Found this webpage about "All Japan Blow Back" event:
http://www.fvpd-guns.com/blowback.htmlIt includes downloadable movies from previous years, as well as awards from previous years, with some pictures and information (in Japanese, of course).
2011 edition will take place in January. Entries are accepted until December 2010.
There are two themes this year, one is the normal blowback, the other is 100 year anniversary of Colt 1911.
Rules: a single cap can be used, as well as electric/gas/spring power. All models have to follow firearms regulations.
Jury will include Tanio Kobayashi and many other people from industry (translation of list and comments who is who would be great).
PS: not sure if website hasn't been already posted, I think I saw it already here, just can't find using search.