Columbia subject headings:
Communist countries--Social life and customs--Congresses.
Europe, Eastern--Social life and customs--Congresses.
Festivals--Europe--Congresses.
Former communist countries--Social life and customs--Congresses.
Rites and ceremonies--Europe--Congresses.
Harvard subject headings:
Communist countries--Social life and customs--Congresses.
Europe, Eastern--Social life and customs--Congresses.
Europe--Rites and ceremonies--Congresses.
Festivals--Europe--Congresses.
Former communist countries--Social life and customs--Congresses.
Princeton subject headings: