The people who are allowed to attend "Shido-sai" are limited to those who are related to the Sumitomo Family and members of "Hakusui-kai," which is a group for the presidents of direct affiliates of the Sumitomo Group and graduates of Hakusui-kai (former presidents).
「祠堂祭」に参列を許されるのは、住友家ゆかりの者と、住友直系グループの社長会「白水会」のメンバーと、白水会卒業生（元社長）だけに限定されている。