Reports on Monday said the students have been asked to reply to the authorities by March 31.
The napkins put by students carried feminist messages.
The proctor of the university said the authorities are not against the protest but the manner of the protest.
"We are not against the message but against the means used. We acted after receiving verbal complaints from students and staff. If the matter becomes severe, we will call for a disciplinary committee to look into it," the Chief Proctor said,