The game is organized in a club format. Teams are grouped in leagues and play games during the months April through September. League Champions move up one level, and the last placed team of a league will step down one level next year. League Champions of the highest levels for each age group will generally be considered National Champion and receive a trophy. The level of baseball at the dutch national league can be compared to A-ball or the American top college teams.
Some clubs have their information brought to the world by Internet.
See the list below. The club page of Euro Stars in Capelle a.d. Every week hundreds of games are to be officiated. That's what the umpires do. At the lower levels of regional baseball, and in youth leagues, the clubs have to provide an official themselves.