Did you get the june Billiards Digest yet? If so, there is an advertisement in their with all the info and I'm sure you can find out some info at http://www.usopen9ballchampionships.com/
Assuming you are talking about the Men's U.S. Open, it is held in Cheasapeake, VA at the Cheasapeake Conference Center from September 19-25, 2005. The matches usually start between 10 AM and Noon and go on all day and most of the night until Sunday.
There is a website for the tourny at 'www.usopen9ballchampionships.com' which give you a lot of details.
I have only visited as a spectator but it seems like a great event to play in.
Did you get the june Billiards Digest yet? If so, there is an advertisement in their with all the info and I'm sure you can find out some info at http://www.usopen9ballchampionships.com/