From a press release issued by the FIM:

Superbike World Championship
2004 provisional Calendar

The provisional calendar for the 2004 season of the Superbike World Championship is the following:

February 29, Spain, Valencia

March 7, tba, tba

March 28, Australia, Phillip Island

April 18, San Marino, Misano

May 2, Japan, Sugo (tbc)

May 16, Italy, Monza

May 30, Germany, Oschersleben

June 13, Great-Britain, Silverstone

June 27, tba, tba

July 11, United States, Laguna Seca

July 25, Great-Britain, Brands Hatch

September 5, Netherlands, Assen

September 26, Italy, Imola

October 3, France, Magny-Cours