Usage patterns
儀礼を守るto observe formal protocol
Diplomats must observe formal protocol.
儀礼上as a matter of formality
I sent an invitation as a matter of formality.
儀礼を行うto perform a rite or ceremony
A rite was performed at the shrine.
〈場所〉で儀礼が行われるa religious rite is held at a place
An ancient rite was held at the temple.