You really don't have to ask permission from your in laws. Pag malapit na ang occasion, remind mo na lang sila and tell them that you have arranged everything for the baby's birthday and christening. You may apologize if you think needed for not telling them ahead of time. Sabihin mo na lang that you found a great deal kaya pinagsabay mo na ung 2 celebrations and hindi mo na naipalam agad sa knila.
Magbasa pa