Columbia subject headings:
Europe--Religious life and customs--Congresses.
Religion and sociology--Europe--Congresses.
Harvard subject headings:
Civilization, Medieval--Congresses
Europe--Church history--600-1500--Congresses.
Europe--Popular culture--History--Congresses.
Popular culture--Europe--History--Congresses.
Superstition--Religious aspects--Christianity--Congresses.
Princeton subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Europe--Religious life and customs--Congresses.
Religion and sociology--Europe--Congresses.