Not sure about the gathering, but for details about the Oath Keepers, you can look them up on this new thingy called the Internet.
the Bilderbergers are meeting in Chantilly (see thread below)
The Bilderberg Conference starts today.
From their website:
Oath Keepers is a non-partisan association of currently serving military, reserves, National Guard, peace officers, and veterans who swore an oath to support and defend the Constitution against all enemies, foreign and domestic … and meant it.