A freshers party is a humble and warm gesture; you may convey to your juniors or new batch students that are going to join the graduate school or the college. It is a welcome to introduce them to the new life and the change, to the college and its environment.
It is important as this is an enlightening to welcome the freshers to a new milestone and motivate them to build more such milestones is the future. As time flys gradually, we understand that the freshers today will be senior tomorrow, welcoming the new batch with the same energy and warmth.