The majority of Grand Masters from the "mainstream" Masonic jurisdictions across North America are off in Denver today through Tuesday for the annual Conference of Grand Masters of Masons in North America.
Hence the name.
Grand Secretaries also generally attend, and have their own sessions. This year's agenda can be seen here.
In the meantime, nobody do anything wrong while they're gone.
Next year's conference will be in Atlanta February 19-21, 2012.