The Christian year consists of the cycle of liturgical seasons based on the life, death, resurrection, ascension, and second coming of Jesus Christ.  Sunday, also known as the Lord's Day, is of primary importance.  The calendar can roughly be divided into two great festival cycles: the Christmas cycle and the Easter cycle, both preceded by a season of preparation (Advent and Lent, respectively), and both followed by a season focused on the Holy Spirit and the expansion of God's kingdom.

St. Mary's follows the calendar from the Book of Common Prayer (1979) for all of the church seasons, Principal Feasts, Sundays, and Holy Days.  That said, The Episcopal Church has approved and authorized Lesser Feasts and Fasts (LFF) (2022) as a resource for commemorating "lesser feasts".  The rubrics are flexible enough to allow for local adaptation and variation. You can view a copy here.

How are "lesser feasts" commemorated in the life of the Church?  At the Eucharist, the following parts of the liturgy are specific to the lesser feast: Collect (the short prayer before the Lessons), Lessons, and Preface.  For the Daily Office, whether prayed privately at home or in public, the Collect proper to the lesser feast may be added after the Collect of the Day (pp. 55 and 68 of the BCP).  You can pray the Daily Office online by clicking here.