Hello! I am Graduating in this May and I'm planning to call my parents. Is it possible to apply visa for a graduation ceremony but arrive here in USA after 4/5 months after graduation, if they are given visa for 5 yrs? Does the visa gets expired , if not traveled within certain time? The thing is that, I want to celebrate Dashain with my parents this year. And it would be easy for my parents as well to travel during Dashain. And could anyone give me an official web site where I can find such information?