Parents applying to visit for my graudation ceremony

[pal4life]

Hi,
I did read the various guidelines but still wondering if there are any particular question that parents need to take care of while applying to visit US for my graduation ceremony. I did come to India in Dec 2010 and my graduation is in May 2011. Would this cause an issue?

What should be the answer for If your son is coming back after graduation, Why do you wish to visit him now?

Let me know of possible answers for above and any similar bouncers or recent experience. My parents are self sponsoring themself.

[immihelp]

1. That's fine.
2. Their desire is not just to see the son, but to see the son live when he is graduating.