Coming up this week at Arlington Cemetery in Virginia. You can read more about this by clicking here.
In addition to the original WW1 Unknown burial, there are side crypts for the Unknowns from WW2 and Korea. There was also a Vietnam War crypt but it is currently empty as subsequent DNA analysis identified the remains originally interred there in 1982 and they were reburied in a national cemetery in 1998.
On October 24th in France the centenary of the selection of the Unknown was observed. Read about it by clicking here.