While drafting poster making is there a need to write issued by or not even if the issuing organisation is not given in questions?
 

Do mention the issuing organisation/authority if it is mentioned in the question.
If not, it is still advisable to write the issuing organisation (as it is an integral part of the format). Ensure it is a relevant organisation in accordance with the given question: could be a school, a government office, a private NGO, etc.

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