Usage patterns
葬儀を行うto hold a funeral
We plan to hold my grandfather's funeral next week.
葬儀に参列するto attend a funeral
Many people attended his funeral.
葬儀を執り行うto conduct/officiate a funeral service (formal)
The head priest conducted the funeral service.
葬儀の準備をするto make arrangements for a funeral
The family hurriedly made arrangements for the funeral.