officiate

/əˈfɪʃiˌeɪt/

• Verb
• to perform the official duties of a ceremony
1. Our parish priest officiated at our wedding.
2. The mayor officiated at the opening of the new public library.
3. The bishop officiated the memorial Mass.
• to be a referee, umpire, or judge at a game, tournament, etc.
1. She officiated at the tennis match.
2. Two referees officiated the hockey game.