Ping.
Commemorating our Lord’s Transfiguration on Quadregesima (50th day before Easter, or, put another way, the final Sunday before Lent) is a modern Lutheran practice which is slowly being adopted by some Protestant denominations.
Roman Catholics keep this commemoration (though not by title) on the Second Sunday in Lent, which leads to some calendar/lectionary reconciliation issues during that season.
Roman Catholics and Orthodox keep the Great Feast of the Transfiguration on August 6, which is precisely 40 days before the Exalatation of the Holy Cross....serving as a bridge to that solemn feast.
All of these placements draw on the wisdom of Leo the Great, Bishop of Rome:
The great reason for this transfiguration
was to remove the scandal of the cross
from thehearts of his disciples,
and to prevent the humiliation of his voluntary suffering
from disturbing the faith of those who had witnessed the surpassing glory that lay concealed.
With no less forethought
he was also providing a firm foundation
for the hope of his holy church.
The whole body of Christ was to understand the kind
of transformation that it would receive as his give.
The members of that body
were to look forward to a share in that glory which had first blazed out in Christ their head.
The Lord himself had spoken of this when he foretold the splendor of his coming:
Then the just will shine like the sun in the kingdom of their father
Saint Paul theapostle bore witness to this same truth when he said:
I consider that the sufferingsf the present time
are not to be compared with the future glory that is to be revealed in us.
In another place he says;
You are dead,
and your life is hidden with Christ in God.
When Christ your life is revealed,
then you also will be revealed with him in glory.