John’s story starts with John the Baptist, and, following that narrative, counting the days from when it starts, the wedding at Cana occurs on the seventh day.
The prelude to the narrative quite clearly alludes back to the creation story of Genesis. It starts with the same phrasing and places the Word at Creation. The Creation narrative can be read and understood as having a wedding on the seventh day between Adam and Eve.
Jesus (the new Adam) and Mary (the new Eve) are the only named characters at a wedding on the seventh day (of John’s narrative). Please don’t take this as implying anything inappropriate about the relationship between Jesus and his mother.
Now let’s also understand that Jesus’ nuptial covenant with his bride, the Church, is consummated on the cross. Jesus’ covenant is seen as a marriage covenant. We see the same marriage imagery in Revelation, also written by John (or at least Johannine tradition). Jesus’ first miracle at a wedding gets us thinking of weddings as we read the Gospel. Jesus is frequently referred to as the bridegroom, and here Jesus performs the role of the bridegroom in providing wine for the wedding.
The idea that Jesus honors his mother’s requests is also a valid understanding, though not the only one, the same way petitioners approached Solomon’s mother instead of the king because they felt Solomon more likely to honor her requests.
Jesus also turns baptismal water into wine, and we understand that he turns wine into blood (John’s readers would already have been familiar with the synoptic traditions). You could see an allusion to Moses turning water into blood in this as well.
The Messianic age was also supposed to be overflowing with abundant wine as well, and having this as Jesus’ first miracle would have brought that instantly to mind for any Jew.
The wedding imagery continues immediately after Cana, too. Jesus meets the Samaritan woman at Jacob’s well, and the brides of Isaac, Jacob, and Moses were met at wells. That wouldn’t have been lost on John’s audience. The woman was married five times, and is now with a man not her husband! This is historically true but also symbolizes idolatry practices brought in by the Samaritans. Who is the true bridegroom in salvation history? Jesus. Who’d just come from a wedding, in which he acted as the bridegroom.
This post feels all disordered. Those are just some thoughts. I’m not proposing any one as THE interpretation, but there is certainly a lot that can be unpacked from the wedding at Cana.