Lucius!

Lucius, i've just received urgent word from Bella. She planned to join us, but it seems the baby thought otherwise: She has gone into labour.

Draco, sweetheart, I'm sorry, I know you were looking forward to seeing Harry on his birthday, but we must leave at once. With any luck you'll greet your new cousin before the end of Freedom Day.

Lucius, please pay our compliments and apologies to Our Lord and meet me at the Floo. She'll need me on hand in case - well, in case.

I am certain He and Harry will understand.