Call my transgender child's name at graduation

Call my transgender child's name at graduation
My transgender child is a senior this year and will graduate in early June. He has been going by his preferred name since the summer between his freshman and sophomore year. Teachers, pastors, managers, family and friends know him as a boy named Wyatt. But at graduation, because of an unwritten standard the school administration is unwilling to change, he will be called by his dead name. What is meant to be a celebration will instead be yet another moment of humiliation and embarrassment.
As Wyatt's parents, we ask that our wishes be honored on behalf of our precious child. Call the name he will bear legally once the lengthy process of a name change is complete. Call him what his future university calls him. Call him what we and many others call him every day. Call him Wyatt.