My parents applied for visa last May as my brother was graduating then. But due to some circumstances, even though they got the visa, they were not able to come here for the graduation ceremony. Now they have decided to come on December during Christmas. Does anybody know if they have to retake the visa? (They had got 5 years visa). Will there be any problem in the port of entry as they applied for visa to attend the graduation ceremony and now its already late for the graduation ceremony?