How does the parable teach about God's sovereignty in salvation?

The parable illustrates God's sovereignty by demonstrating how the king orchestrates not only the invitation to the wedding feast but also the ensuing judgment on those who reject it. God's sovereignty is evident as He exercises absolute authority over His kingdom; He determines who will be called and assures that the feast will be filled, regardless of initial rejection. This reinforces the Reformed understanding that salvation is entirely a work of God, with His grace irresistibly drawing the elect to Himself while justly dealing with those who remain obstinate in their sin.