Anyone who needs a chair in the main ballroom, will be charged an extra guest fee. Generally, we say any guest over the age of 2 or 3.
If you are planning to have a lot of children at your event, a great option is to rent the lower level and have a kids party. You can hire a few babysitters, bring some children’s movies, and order pizza. This is also nice for the parents, as they can enjoy the reception knowing that their child is safe, and just a few stairs away.