Hi Everybody,
I invited my parents for my graduation and they already got visa (multiple entry for 5 years). But now due to some reasons I would like them to come a month after my graduation. Will there be any problem in the port of entry coz they were supposed to be here early. I heard rumors that the immigration officer can deny access to US (i do not how unusual is this?). Do you  happen to know any case like this where parents visited US long after graduation (but applied visa for attending graduation) or any case that they were denied access.
Would appreciate any thoughts.