Yes! Austin and Casey love children, and want them to be a part of the big day.
Yes, Casey's side of the family has a special tradition of having a wedding day 5k the morning of the wedding. It is not required to walk or run in the 5k, all are welcome, even if it is just to chat!
The couple would prefer it if all the guests dressed formally. But they understand if it is not in the budget for you or your family. All they care about is celebrating with you on the big day. Just no white (;
Yes, if the invitation you receive includes a plus one then a date is okay to bring.