What are the main conflicts of each act in A Midsummer Night's Dream?

In Act I, Duke Theseus directs Hermia to marry Demetrius. He has her father Egeus’s permission, but Hermia and Lysander are in love. The duke says she must marry the man of her father’s choosing, die, or “live a barren sister all [her] life.” Adding further conflict to this lovers’ conundrum is Helena, who adores Demetrius. Meanwhile, Peter Quince casts his play Pyramus and Thisby. There are a few small conflicts about who will play whom, but the main tension in this act is between the lovers and the law.

Act II introduces the fairies and the clash between Queen Titania and her husband Oberon, who quarrel over the possession of “a little changeling boy.” Titania says that their argument is disrupting nature’s cycles: “this same progeny of evils comes / From our debate, from our dissension.” Oberon puts a love potion in his wife’s eyes as she sleeps, and, mistaking him for Demetrius, Puck enchants Lysander. Helena pursues Demetrius, to his chagrin, before stumbling across Lysander. When he wakes up, he falls in love with Helena and abandons Hermia.

In the third act, the rude mechanicals struggle over their lines until Puck creates supernatural conflict by transforming Bottom’s head into an ass’s. Titania wakes to fall for him, creating great amusement for Puck and Oberon. Puck attempts to right his mistakes by giving Demetrius the love potion. Unfortunately, this leads to one of the play’s biggest conflicts. Demetrius and Lysander fight over Helena, Helena believes they are mocking her, and Hermia attacks Helena for stealing her lover. Puck eventually causes them to sleep and removes the love potion from Lysander’s eyes.

Act IV offers resolutions to the conflicts. Titania fawns over Bottom before falling asleep. Oberon then returns her to her normal self and plans to reconcile with her, having taken the changeling during her enchantment. Theseus and Hippolyta find the lovers while hunting in the woods, and the duke overrules Egeus’s arrangement with Demetrius, who is now in love with Helena. The players mourn Bottom’s disappearance and their ruined play, but a restored Bottom returns and brings them cheer.

Act V concludes the play with a performance of the ridiculous Pyramus and Thisby before the nobles. The conflicts here are mostly subtle and internal. Theseus and Hippolyta disagree about whether the lovers’ fantastical tale is true, and Philostrate discourages Theseus from choosing the rude mechanicals’ play as entertainment. The viewers then comment on the terrible production, to which Bottom feels the need to respond, while on stage. The lovers go to bed, the players are “made men,” and the fairies bless the couples.