Forget about sending  birthday cards to your friends in Saudi Arabia. Grand Mufti Abdul-Aziz al-Shaikh of Saudi Arabia says birthday celebrations are not righteous.  Mother's Day too. The UK Daily Mail reports:

Shaikh said celebrating such events would make Muslims like followers of other faiths including Jews and Christians, al-Madina newspaper reported. [….]

"A Muslim should thank almighty Allah if his children are healthy and if his married life is stable as the years pass by," the paper [al Medina] quoted Shaikh as saying.

Two occasions call for celebration in the Muslim world, Shaikh said: Eid al-Fitr, which marks the end of the fasting month of Ramadan, and Eid al-Adha, which marks the end of the annual haj pilgrimage.