Here's a link.
http://www.onwe.co.za/frank/faqlink.htm#UGAMERICA
All I could see was :

Association
of Oracle Professionals
The Oracle Users Group for the
Washington DC Area

OTSIG Meeting
Friday July 28th from 1:00 to 4:00 PM
Oracle Building Bethesda, MD (Map)

On fridays as you said.

It's probably the only one.