All 4 Uses

convention
in
Cry, the Beloved Country
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Our natives today produce criminals and prostitutes and drunkards, not because it is their nature to do so, but because their simple system of order and tradition and convention has been destroyed.
Chpt 2.20 *

convention = what is normal or typical
She was respectful to him, as it behooved her to be to an elder brother and a parson" and they exchanged conventional conversation; but never again did they speak of the things that had made her fall on the floor with crying and weeping.†
Chpt 1.10
Our civilization has therefore an inescapable duty to set up another system of order and tradition and convention.†
Chpt 2.20
And people that he did not know shook hands with him, some speaking their sympathy in brief conventional phrases, some speaking simply of his son.†
Chpt 2.21

Definitions:

(1) (convention as in: teacher's convention)
a large conference or meeting
(2) (convention as in: conventional behavior)
something regarded as normal or typical
(3) (convention as in: The Geneva Convention)
a written international agreement
(4) (meaning too rare to warrant focus)