Your honorarium is considered self-employment, you are correct.
You are not required to fill out all of the business information, however, you do need to input the industry code. If you cannot find a code for the exact industry, choose the closest you can find.
(For the business name, you can just put the initials of the business).
To locate the industry code of the company from which received your honorarium, please see:
Industry codes - Canada.ca
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