Columbia subject headings:
Harvard subject headings:
Fasts and feasts--Europe--History--Congresses.
Festivals--Europe--History--Congresses.
Festivals--Political aspects--Europe--History--Congresses.
Princeton subject headings:
Europe--Anniversaries, etc.--Political aspects--History.
Europe--Anniversaries, etc.--Religious aspects--History.
Europe--Social life and customs--History.
Festivals--Europe--Religious aspects--History.
Festivals--Political aspects--Europe--History.