Mansfield Stadium in Bangor is going to be the hub of baseball over the next eight days. The Senior League World Series begins with opening ceremonies starting at 7:30 Saturday evening. The ceremonies are free to the public. Governor Baldacci and CEO of Little League Steve Keener will speak. District Three champion Bangor will open play on Sunday at noon against Canada. Bangor is 4-16 in the last five appearances. Semi-finals are Friday with the championship game on Saturday.