The Conciliar SSPX follows the Conciliar Church for the Feast of the Ascension

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To show the importance of the great Feast of the Ascension, now relegated to nearly an afterthought by the Conciliar Church and now the Conciliar SSPX, the following is taken from Dom Prosper Gueranger's The Liturgical Year by for the Friday after the Ascension as a simple illustration of how vital the commemoration and observance of the Ascension is:

The Feast of the Ascension shows us the work of God in its completion. Hence it is that the Church, in her daily offering of the holy Sacrifice, thus addresses the Eternal Father: the words occur immediately after the Consecration, and contain the motives of her confidence in the divine mercy: 

“Wherefore, O Lord, we thy servants, as also thy holy people, calling to mind the blessed Passion of Christ thy Son our Lord, his Resurrection from the dead, and his admirable Ascension into heaven, offer unto thy most excellent Majesty a pure, holy, and unspotted Host.”

It is not enough for man to hope in the merits of his Redeemer’s Passion, which cleansed him from his sins; it is not enough for him to add to the commemoration of the Passion that of the Resurrection, whereby our Redeemer conquered death: man is not saved, he is not reinstated, except by uniting these two mysteries with a third—the Ascension of that Jesus who was crucified and rose again. During the forty days of his glorified life on earth, Jesus was still an exile; and like him, we also are exiles until such time as the gate of heaven, which has been closed for four thousand years, shall be thrown open, both for Him and for us.