Http://hornbillfestival.co.in/itinerary.php You can go to this link, do your bookings and send out the needed documents. It will take 3-4 working days after you send your documents to obtain the ILP.
Https://www.explorenagaland.com/northeast-india-permits-rap-pap-ilp/ You can download the form From the link available on this website and apply for an ILP yourself.
Hi Shinjan, you can easily get ILP by applying for it at Nagaland house, you can find one in Delhi, Mumbai, Kolkata or Guwahati. You will just have to fill up a form and you will get it in few hours