Wikipedia: Mother's Day-
Type: Commercial, religious

Celebrations of mothers and motherhood occur throughout the world; many of these can be traced back to ancient festivals, like the Greek cult to Cybele, the Roman festival of Hilaria or the Christian Mothering Sunday celebration. However, the modern holiday is a US modern invention and it is not related to these celebrations. Despite this, in some countries Mother's Day has become synonymous with these older traditions.

So it really was newly invented "celebration". We cannot merely be their followers and practice what Islam thought us to be.