Visitors ask...Jubilate Deo Sunday or Jubilate Deo Mass
I presume this refers to " Jubilate Sunday ." As the inestimable New Advent Catholic Encyclopedia explains , The third Sunday after Easter, being so named from the first word of the Introit at Mass — " Jubilate Deo omnis terra " (Psalm 65). The Introit for this Mass is: Jubilate Deo , omnis terra, alleluia: psalmum dicite nomini ejus, alleluia: date gloriam laudi ejus, alleluia, alleluia, alleluia. -- Dicite Deo, quam terribilia sunt opera tua, Domine. In multitudine virtutis tuae mentientur tibi inimici tui. V.: Gloria Patri . . . -- Jubilate Deo, omnis terra . . .