My name is ___________ (name) and I am studying in __________ (department) of your reputed college. My roll number/ student ID number is ____________ (mention your roll number/ student ID number).
I would like to inform you that a book fair is being organized at ____________ (property/ venue). I am writing this email in order to request you to kindly allow me to visit the book fair on __/__/____ (date). This will be helping me in getting more information and knowledge about the authors and books.
I hope that you will allow me permission to go to the book fair. I shall be highly obliged for your kind support.
________ (Roll number),
________ (Contact details)