Columbia subject headings:
Harvard subject headings:
Amusements--Social aspects--Congresses.
Games--Social aspects--Congresses.
Play--Social aspects--Congresses.
Social control--Congresses.
Social norms--Congresses.
Princeton subject headings:
Amusements--Social aspects--Congresses.
Games--Social aspects--Congresses.
Play--Social aspects--Congresses.
Social control--Congresses.
Social norms--Congresses.