かんこう慣行kankou
1.

A practice or procedure that, although not formally documented, is traditionally followed within an organization or community to promote unity and camaraderie, encompassing various activities such as meetings or seasonal celebrations.

2.

An established norm or ritual observed within a society or group, reflecting long-standing customs that members adhere to for cultural or social reasons.

3.

A traditional method or unwritten rule that governs behavior and interactions within a specific context, often rooted in historical precedent and collective agreement.

4.

An accepted way of doing things that defines the routine and lifestyle of a particular group or organization, often including annual events or ceremonies that foster a sense of belonging.

Example:

その慣行は廃止すべきだ。