This time window is the most probable time frame for the Event. I can give you no guarantees that the Event will happen within this time frame, as we live in free will universe and the war between Light and Dark on this planet is not over yet. However, this Window of Opportunity is exatly that - a great opportunity that we as a collective make this breakthrough.
Complexity wave analysis shows that this time frame is the most complex period in the known history, surpassing even the famous December 21st, 2012. This means that it will be the most volatile, inpredictable time with greatest potential ever. All the major players are involved and stakes are high.