Note: Further down this thread, I have posted a newer version of this Mass (complete), with both English vernacular and Latin/Greek settings of the Kyrie, Gloria, Sanctus, and Agnus Dei. Also, there are a few minor changes in editions uploaded before that.
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Here is my recently completed Missa Ascensionis Domini for Cantor &/or Choir, Organ, and Congregation. Some notes about the work follow.

There are two Kyries, one in Greek with 3-3-3 format (the Congregation joins in the second iteration of each section), one in English with 2-2-2 format (the Congregation joins in the repeats). The Gloria and Sanctus are in English. The Agnus Dei, like the Kyrie, comes in two flavors, Latin and English, both with almost identical music that features an optional Soprano Descant which, for Congregational use, should probably only be used once the Congregation is comfortable with the melody. In addition to the usual Mass Ordinary, there are also a Gospel Alleluia (with single Angiclan chant tone for the Alleluia Versicle), a Gospel Acclamation for Lent (with similar structure as that of the Gospel Alleluia) and a slightly longer Gospel Acclamation for Palm Sunday and Good Friday (with double Anglican chant tone for the Versicle "Christ became obedient"). The three Memorial Acclamation texts are also set (to basically the same music), and there is a three-fold (optionally two-fold) Amen. I have not (as yet) set the Credo (I'm ambivalent about doing so).

The order of composition (except for revisions) for the four principal movements was 1. Kyrie, 2. Agnus Dei, 3. Gloria, 4. Sanctus. The Gospel Alleluia and Acclamations draw on music heard in the Gloria. The Sanctus has musical features in common with the Kyrie, Gloria, and Sanctus. The Gloria and Angus Dei share some musical material, too. This should facilitate learning the Mass setting by the Choir and also for introducing it to the Congregation - probably piecemeal, starting perhaps with the Gloria or Sanctus (or perhaps, even more simply, the Gospel Alleluia). The Kyrie and Agnus Dei (as originally published at CPDL a few years ago) have been performed several times, both here and abroad, and the more recently composed Gloria has been sung here in the United States.

An SATB (with Organ) score and an Organ-Cantor (or -Unison) score are attached. I have yet to assemble Congregation parts for inclusion in a bulletin or worship aid, but will do so shortly. I have MP3 sound files for all the movements and will post them here in the next day or two.

One may ask, why Ascension? Well, while this Mass setting is intended for use at any time of the year, it just so happens that it was inspired by and reflects my own personal identification with the Ascension. This is also seen in the frequent use of A (minor & major) as a key signature or tonal center. This doesn't preclude other notes/chords/key signatures from entering the picture symbolically, notably D minor symbolizing the Lord's Death, D major symbolizing the glorified God, C-sharp (mostly major) the Crucifixion of Christ, and G major modulating to E major (in the Amen) the Resurrection of our Lord and Savior.

Note: The scores in this post are somewhat obsolete. Latest scores further down the thread.