Answer:
A programme will be conducted by the department on Republic Day.
Explanation:
In grammar, the term voice refers to the relationship between the action expressed by the verb and the participants of the described event (the subject and object). In English, there are two types of voice:
In order to turn the given sentence into a passive one, we need to make its object the subject. The object is a programme.
The subject is the department. In passive voice, the subject becomes the object of the preposition by.
The verb needs to be changed as well. The tense remains the same, but it needs to contain the past participle.
This is how we'll get the following sentence:
The image attached below can help you visualize this easier: