Ceremonies are always great events, right? The city is breaking ground on a new development, or the library is opening a new branch.
All local papers cover these types of events, and many write the phrases ribbon-cutting ceremony and groundbreaking ceremony.
This is redundant.
From the Webster's New World College Dictionary, Fourth Edition (the dictionary preferred by The Associated Press):
ribbon- cutting (n.) a ceremony marking the official opening of a site, the commencement of its construction, etc., typically involving the cutting of a ribbon suspended across an entranceand
groundbreaking (n.) a groundbreaking ceremony for a new buildingNow, for groundbreaking, I can see more of an argument of using it as an adjective, which is the first use of the word in the dictionary.
Still, I think you would be hard-pressed to find someone who wouldn't understand the word as a noun.