Within the year after a loved one dies, members of his or her immediate family should arrange for a monument for the grave.
Jewish tradition requires nothing more to be done.
Survivors need not hold an unveiling or dedication of the tombstone. In fact, such a ritual is not mentioned in the Talmud nor in any of the historic Jewish law codes. It is a uniquely American and British practice. Our forebears in Central and Eastern Europe never knew of this practice. However, when asked, we Rabbis of Temple Beth-El are available to conduct a ceremony of dedication or to provide a family representative with the prayers to do so.