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Use "feast day" in a sentence
"Now, if in order to celebrate the Mass of Requiem, the Mass must be offered for the dead, and if there is only one Mass in a parochial church on a feast day which must be offered pro populo, it is manifest that this Mass may never be one of Requiem, but, on the contrary, as the Congregation of Rites has frequently declared, it must always be according to the Office of the feast."
"It was 22 July—the feast day of Mary Magdalene, which is pointed out as being of singular significance by all the contemporary writers."
"Commemoration may not be celebrated either on a feast day or on a double of the First Class; wherefore, it may be called a Double of the Second Class."