The phrase "official ceremony" refers to a formal event where important people gather together to perform specific actions or celebrate special occasions in an authorized and organized manner. Full definition
• Coordinated, scheduled and maintained the performance of official ceremonies of national and international significance in a highly visible and stressful environment. (resumemycareer.com)
Performed official ceremonies of national and international significance in a highly visible and stressful environment. (resumemycareer.com)
Other than the TV coverage of official ceremonies, there was little discussion beyond a few reports and opinion pieces. (blog.politics.ox.ac.uk)