This shows how teams move between the 2015 PNW district events. Each of the bubbles is an event. Each column of events represents a week of competition. The lines show teams going from one event to their next. The numbers next to the lines are the number of teams. Whether a line is solid, dashed, or dotted is also an indication of the number of teams.
If people are interested, I will post versions I have prepared for the other districts.