Hello to you, too.
Congratulations for your son.
No, I'm afraid. It's only for students.
It's a sort of ritual to admit them as a formal member of the college, so only members of the college can attend. No outsiders.
You drop your son/daughter and their belongings at the college on a day you're told to drop them (usually the weekend before the freshers week starts, unless you're an international, in which case they're advised to arrive a few days/a week earlier), and you say good bye to them.
Some parents stay a few hours with them and a cafe is open for them to have some refreshment and light meal, snack. But that's it.
A student can invite up to 3 guests, including their parents, for their graduation, though.