A wedding in Cana - In the Bible a wedding was always a big deal, and some of Jesus' teachings drew on imagery from wedding celebrations (see Matt 9:15, 22:2-14, 25:1-3; Luke 12:35-36; 14:7-11). Jesus used such illustrations because marrage celebrations were a well-known and popular feature of village life. Weddings were cherished occasions.
In John 2:1-12 (Read Verses) we see a wedding. Jesus, his mother Mary and five of his disciples were in attendance. When the wine was gone we see Jesus perform his first recorded miracle. We see Jesus have the servants fill the jars with water to the brim, by filling to the brim indicates that there in no way to add wine later; this will prevent attemps to explan away the miracle that is about to happen as being any kind of sleight of hand. Not even a prayer is recorded as being offered as soon as the containers were filled, their contants was wine.
During Bible times weddings lasted up to seven days to run out of wine would be a social disaster. We gain clarity when we understand the purpose of miracles from the Bible perspective. Miracles were not Jesus' way of helping the helpless. They were a way for him to show his divine glory and bring unbelievers to faith as a result.
John emphasizes that miracles were not merely displays of power but had a significance beyond the mere acts themselves.