At the end of the play, the fairies do enter an alternative court at Athens that has been transformed from what it was as the play opened. Originally, it was a rigid, patriarchal place. With Theseus's backing, Egeus was about the force his daughter Hermia into a loveless marriage, one sanctioned in Athens by the supremacy of male power.
By the time the fairies return at midnight to clean up after the weddings, the court of Athens has been transformed into a place in which love and light hearted joy reigns, rather than remaining a rigid, legalistic patriarchy. Hermia is now married to her beloved, while Demeter has been sorted out to reconnect with his true love, Helena. Theseus and Hippolyta are also married, and the light-hearted, zany, unprofessional play put on by the Mechanicals represents the supremacy of joy over order.
The time the lovers spend in the alternative kingdom of the fairies in the forest, subjected to their reign of love in the form of love potions, has been variously interpreted. However, it can be read as a time of transformation. Rather than impose "law" on the lovers, the forest fairies magically open a space in which more love can blossom. This is brought back, in this reading, in a transformative way to the Athens court. The power of the fairies is amplified as the play ends with their blessings on and promises to the new couples.