One way to understand the structure of the GWP is that it is designed to systematically organize the instruction, edification and training for men who want to do the work of an evangelist full-time.
The two times of gathering together serve these purposes:
GWP Training: time to learn and apply without distractions both principals for living the evangelist life and of preaching so that a foundation is laid for the coming year and years.
Super Bowl Outreach is a time to apply the lessons from the year together.
In both situations fellowship is highly valued: at the GWP there is much prayer and conversation including families and at the SBO with a variety of other evangelists.
The calls between these two gatherings simply facilitate the training and fellowship throughout the year.