Observance

Practice of following a law, custom, or rite.

observing observance

Observance is the practice of following a law, custom, or religious rite. It can also refer to a formal recognition or celebration of an event or person.

/ˈɒbzərvəns/

Observance comes from the Old French 'oser' meaning to dare, and ultimately from the Latin 'ausere' meaning to be bold or daring.

adherence compliance respect

practice custom ritual

anniversary commemoration celebration

tradition religion law

religious practice social custom