Critical New Testament scholarship generally treats the Wedding at Cana, like most episodes unique to John's Gospel, as reflecting John's own distinct theological and literary purposes rather than as an episode independently corroborated by the earlier Synoptic sources. John's Gospel organizes much of its narrative around a sequence of seven signs, of which Cana is explicitly identified as the first, each chosen and presented to demonstrate a particular aspect of Jesus's identity to John's intended readers.
The absence of any parallel account in Matthew, Mark or Luke does not by itself settle the question of whether some historical tradition underlies the story, since ancient biographical writing routinely selected and arranged material according to an author's purposes rather than attempting comprehensive coverage, and John explicitly states near the end of his Gospel that Jesus did many other things not recorded in his account.
Within Christian liturgical tradition, the episode is grouped with the Baptism of Jesus and the visit of the Magi as one of three events associated with the Epiphany season in Western Christianity, each read as a distinct manifestation of Jesus's divine identity to a different audience, the Magi representing the Gentile world, the Baptism representing divine testimony from heaven, and Cana representing the revelation of his glory to his own disciples.