The only thing I have read is that usually everyone does get in. The 4 on the list go in and find seats and then the others must wait until right before the ceremony starts and if there is room, they let them in but I may be standing room only. I know that my daughter's father's parents are coming and they are not on the list and are going to try to get in.

they wont be able to get in. only four seats per sailor and only the ones one the list will get in.
they mean it. its all in that very first letter that gets sent home.

The have let people wait to see how they fill up. It also depends on how many Div. graduating on that day. I know also that in my PIR group some put out that they needed more spots and if anyone had any to give up then they would private email the family names and the other person would let there son/daughter know. Do make sure if you do it this way that your son/daughter lets them know because you can't make add on or any changes on the last week before PIR. Make sure that they all have picture ID. If they don't make it in they can come on Base and shop at the NEX or eat there with your Sailor.