The Red Sox play before a sellout crowd at Fenway Park. They will continue to do so for almost a decade, breaking the record for consecutive sellouts (held by the Cleveland Indians at Jacobs Field) on September 8, 2008. The streak will not end until April of 2013.

This Day In Baseball

On May 15, 2003 — The Red Sox play before a sellout crowd at Fenway Park. They will continue to do so for almost a decade, breaking the record for consecutive sellouts (held by the Cleveland Indians at Jacobs Field) on September 8, 2008. The streak will not end until April of 2013.

Source:
Baseball Reference May 15