From a press release issued by Octagon Motorsports:

2003 FIM World Endurance Championship Schedule

4/6 tba

5/25 Assen, Holland, 200 miles

6/28-29 Albacete, Spain, 12-hour

7/20 A-1Ring, Austria, 6-hour

8/3 Suzuka, Japan, 8-hour

8/23-24 Oschersleben, Germany, 24-hour

10/5 Vallelunga, Italy, 200 miles