Conference attendees from outside the European Economic Area (EEA) may require a travel visa to enter the Schengen Area.
Consult the list of non-EEA countries whose nationals do not require a visa. In some cases, a biometric passport (ICAO compliant) is required to enter without a visa (see footnotes for your territory). Contact the Belgian embassy or consulate for your territory when in doubt.
Short stay visa for professional reasons: application guide.
If you require a letter of invitation to support your visa application, please contact the local organizers.