Ah that's it, thanks, Madrigal.

In fact, there are always time-limited themed exhibitions, organised by the Japanese poser content creators / users. 

Everyone who submits renders to these exhibitions gets unique freebies as prizes ( poser content ) which are not available in any other way.

Most recent prize was an Asian-style fantasy shirt and neckscarf set for M3, if I am not mistaken.

For more opportunities at current exhibitions, check out Poserclub.JP for the relevant exhibition links.  Same set of links also available at Forum3D.net

All in Japanese with some guidelines in English.

Enjoy.

Eternal Hobbyist