The answer to this specific question is not a simple one, because the difference among the definitions of Seminars, Conferences, Symposiums and Workshops are sometime difficult to highlight.
For example a Seminar can be considered as a formal presentation by one or more experts in which the attendees are encouraged to discuss the subject matter.
On the other hand, a Conference is a large meeting for consultation, exchange of information, or discussion, with a formal agenda. A conference is usually large, possibly taking up many rooms in a hotel or a convention center. It usually takes up several days. It can also describe a single, small meeting but with a duration of several days or weeks.
The Symposium is a meeting at which experts have discussions about a particular subject; it can be considered as a small conference. A symposium is usually used to describe a small conference on a single subject. For example, a series of lectures in a single day might be called a symposium.
Finally a Worksop is a meeting at which a group of people engage in intensive discussion and practical activity on a particular subject or project.
