Taken from Google
Do we really know when our Blessed Virgin Mary's birthday is? We can't know for certain, of course, but for almost 15 centuries now, the Nativity of the Blessed Virgin Mary has been celebrated on September 8. Those who are quick with math have already figured out that September 8 is exactly nine months after December 8, the feast of the Immaculate Conception of Mary.
Most devout Catholics here in the Philippines celebrate this day by attending mass and thanking her for being the intercession to our Lord Jesus Christ. Also this is the day that my prayers were answered as it is the day that me and my wife became officially a couple.