Leftists infiltrate *everything*. I think a CC is the worst idea in a _long_ time.
Some states are integrating rules that delegates cannot legally vote on anything not approved by the state legislature. Other states have mandated that delegates can only vote for a single change, a balanced budget amendment. This means that unless the process is streamlined, there is no way it can reach the 38 vote threshold.
Thus the biggest threat is of espionage conducted against the convention by US agencies and foreign governments. Security at the convention will have to be very high, and layered, with the host state using its resources to keep interlopers out.
Electronic communications to and from the convention may need to be prohibited, with messages to and from state legislatures being carried by courier with heavy armed escort.
The list of precautions goes on and on.