How do you say happy palm Sunday in Arabic?

To say "Happy Palm Sunday" in Arabic, you would say "أحد السعف مبارك" (Ahd as-Sa'af Mubarak). This phrase conveys warm wishes for the celebration of Palm Sunday, which is observed by many Christian communities. The term "أحد السعف" specifically refers to Palm Sunday, while "مبارك" means "blessed" or "happy."