Custody- is Christmas Eve a holiday

Recently my ex and I went to court for custody of our son. We got joint custody and part of the agreement is we alternate holidays annually. So I get all holidays this year, and next year my ex gets all holidays with our son. In the agreement most of the holidays are listed but Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> is not one of them. So is Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> an actual holiday or just Christmas