It is now summer and we find ourselves in the Season After Pentecost. This is essentially the part of the liturgical year that remains after everything has been accounted for. The name of this season can vary widely depending on a church's tradition - it can be called Kingdomtide, Dominiontide, or Ordinary Time. The term Ordinary Time does not mean that this season is plain or unimportant. It is called that because the weeks are numbered. The Latin word ordinalis, which refers to numbers in a series, stems from the Latin word ordo, from which we get the English word order. In most churches the general theme of the Bible readings concerns the church's mission in the world. The Season After Pentecost begins on the day after Pentecost. In the Western Church, it ends on the Saturday before the First Day of Advent. The main holy days during this season are Trinity Sunday (the Sunday after Pentecost), The Transfiguration, Holy Cross Day, Reformation Day, and All Saint's Day. You may notice that the paraments on the altar and the worship leaders’ vestments change to green, the liturgical color for the season.
— David McNease