Accordingly, the twenty-seventh day of each month is designated as 'butsudan no hi' (the day of Buddhist altars) by Zen Nihon Shukyo Yogu Kyodokumiai (literally, a Cooperative of Religious Utensils Dealers of all Japan).
それにちなみ全日本宗教用具協同組合では毎月27日を「仏壇の日」に制定している。