John Lightfoot on John 2:8

[The governor of the feast.] This governor of the feast I would understand to have been in the place of chaplain, to give thanks, and pronounce blessings in such kind of feasts as these were. There was the bridegroom's blessing, recited every day for the whole space of the seven days, besides other benedictions during the whole festival time, requisite upon a cup of wine (for over a cup of wine there used to be a blessing pronounced;) especially that which was called the cup of good news, when the virginity of the bride is declared and certified. He, therefore, who gave the blessing for the whole company, I presume, might be called the governor of the feast. Hence to him it is that our Saviour directs the wine that was made of water, as he who, after some blessing pronounced over the cup, should first drink of it to the whole company, and after him the guests pledging and partaking of it.

As to what is contained in verses 14, 15, and 16 of this chapter, I have already discussed that in Matthew 21:12.