employees sharing info about the PRIVATE event on their twitter or other sites should be tracked and fired
You really think that? It is not company secrets to share your thoughts or that you liked it or what happened. Read George Orwell's 1984 again, please. We live in an open society, at least that is what I think it is. If one of the employees shares their thoughts or states that this or that was awesome, it would not be harmful nor disgracing. Now, this event is also part of the employee's life and she or he can share that and their thoughts about it with whom they want.