I will try and explain all I know about Fetishhouse and the Venus Night parties as I have been following them on the internet since I discovered that site in the late 1990s.
Fetishhouse is and started out as an independent video producer in the late 1990's focusing on specific fetishes -
ballbusting, trampling, spitting, boots, pantyhose, gloves, handjobs, etc.. I do not know the owner's name but he is in many of the videos and I would say now in his 50's.
Here is their latest DVD ordering page -
http://www.fetishhouse.com/dvdshop/
Up until 2004-5 or so it was very hard to get his videos outside of Japan but of course today it is not a problem.
His older videos were not well shot and he used crude techniques like fisheye lens and peep cameras.
Coincidentally one of his main actresses is Mayumi Aso (she also attends the Venus Night parties.)
http://blog.livedoor.jp/mayumi_aso/
who used to go by the name Queen Asami when she worked out of the Aprhodaite club(now closed) in Kabuki-cho during about 2004-2008.
The Venus night parties evolved from earlier fetishhouse fetish party gatherings where a small group of "slaves" would engage in various fetish play with (what I assume paid) hot Japanese amateur Queens.
I have included a few photos from some of the earlier parties and as you can see they were quite wild. They included a lot of bootworship, spitting, pee drinking games, and even some scat play. These early parties seem to have occurred in private houses which probably allowed for the wilder play.
I have never seen any foreigners in all of the photos from these parties.
Over the years, the owner started to rent out club spaces to have bigger parties and that is when the Venus Night name came into being. Photos show girls coming to these parties in long boots and most of the play was foot/bootworship and trampling. The owner also started filming these parties for his video business.
Then a few years ago he started to have the Venus night at Club Eureka. The latest party was in June as as you can see from the photo gallery I linked to in my last post - it looked like a lot of fun.
I would love to hear from any foreigners who have been to one of these Venus Nights because I have always been curious about them. I am sure foreigners are welcome but I would assume that Japanese speaking is required.
I hope this information helps a little bit.