A "cutting ceremony" refers to a special event where something, like a ribbon or cake, is cut. It is often done to mark the beginning or celebration of something new, like the opening of a building or the start of a wedding reception.
As the day came to a close, all of the volunteers came together to clean up the site in preparation for the ribbon cutting ceremony at 3:30. (letsplay.com)
WHEELS will have a ribbon cutting ceremony in the fall to officially open the college readiness center. (manhattantimesnews.com)
After a ribbon - cutting ceremony today, the residents went inside for a training session on using the new security system. (thelodownny.com)