Let's take a look at each act and all of the scenes in them.
Act one has two scenes, and their purposes are for establishing plot and characters. Scene one introduces us to Theseus and Hippolyta, who will soon be married. Then the lovers enter, and we learn that Lysander and Hermia wish to marry each other. However Demetrius is also infatuated with Hermia, and her father wants her to marry him. Meanwhile, Helena pines for Demetrius.
Scene two introduces the mechanicals, and the play they will perform. While it is important because we meet Bottom, who will soon fall victim to Puck's trickery, scene one introduces more characters and sets the larger plot in motion: Hermia and Lysander will escape in the forest, but Helena decides to tell Demetrius of their plan.
Act two also has two scenes. In scene one, we meet the fairies and learn of the dispute between Oberon and Titania, which is also affecting nature. Oberon has Puck fetch a flower that will make Titania fall in love with the first...
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