| 16 December 2002 | Workshop proposals due |
| 28 February 2003 | Tutorial proposals due |
| 20 January 2003 | Notification of workshop acceptance |
| 24 March 2003 | Notification of tutorial acceptance |
| 5 April 2003 | Paper submission available |
| 15 April 2003 | Paper abstracts due |
| 2 May 2003 (revised) | Full paper submissions (other than Industrial Track) due |
| 12 May 2003 | Workshop URLs due Tutorial URLs due |
| 31 May 2003 (revised) | Industrial Track full paper submissions due |
| 25 June 2003 (revised) | Notification of paper acceptance |
| 13 July 2003 | Poster abstracts/summaries due Demo proposals due |
| 6 August 2003 (revised) | Camera-ready papers due |
| 15 August 2003 | Semantic Web Challenge registration opens |
| 31 August 2003 | Notification of poster acceptance Notification of demo acceptance Early registration deadline |
| 3 September 2003 | Tutorial notes and technical papers due |
| 4 September 2003 | Hotel reservation cutoff |
| 15 September 2003 | Semantic Web Challenge submissions due |
| 20 October 2003 | Workshops Tutorials |
| 21-23 October 2003 | Technical Program |