All those who are interested to visit Belgium for attending a conference, seminar, workshop, etc. requiring a short stay period should apply for a short term visa is known as “The Uniform Schengen Visa” – Type “C” category.  This type of short term visa will permit an applicant to stay for a maximum of 90 days in Belgium. The following are the documents required for the visa application.

A completed and signed application form, complying with the harmonized SCHENGEN visa application form.
A travel document (e.g. a passport), valid for at least 3 months from the date on which you intend to leave the SCHENGEN territory.
Proof of sufficient financial means for the period of stay.
A cover letter stating the purpose of visit to Belgium and itinerary.
2 photos must be attached which are of a passport format.
A letter of invitation from the host organization.
For further details on visa application, please visit the below link: http://www.schengenvisainfo.com/belgium-visa/