The Kings now have not 1 but 2 goalies who have last names that start with the letter "Z" in the system. Maybe this could be a new tradition. I would if there are any "Z" goalies available for next years draft?
Most teams start their prospect camps earlier than posted. They usually do video/film of each prospects skating while working with skating coaches. Some teams bring in specialty coaches for stick handling, power skating, etc. A lot of teams do tourist stuff with the guys such as baseball games, amusement parks, etc. to learn about the different personalities.
The posted dates are for scrimmages that the fans can come see.