Who is empowered to regulate the use of navigable airspace over the U.S.?

As an aircraft owner and private pilot, as well as a sailing aficionado, you always like to fly over (always at a safe altitude and distance) with your closest friends as passengers to observe the annual sailing regatta put on by a local yacht club in an area under Class G (uncontrolled) airspace. The event comes around again tomorrow, and you and your passengers are especially excited, because the nightly news just reported that the president of the United States will be a participant in this year's event. Could this affect your plans? Why?