Overall this is as smooth as an event can go given all factors combined.
•Great soundtrack selection
•Good scripting both in map and sequencing
•Player "Control" fell apart quickly at the end
•Fairly massive "World Situation Change" (Class-X Breach)
•Plan "Area Focusing" methods.
In the event that player characters are faced in a situation of panic, and given autonomy, they are quick to go loose and run around the world. Try controlling this by locking down areas or establishing pre-set leaderships/hazards to deter roaming.
•Question: "How will this affect our server in the long run"
Oftentimes great events come with great ideas, and lead to dramatic changes in the way a server is experienced. Always think of how drastically your event could change the "base game".