Lysander and Hermia are forbidden to marry each other because Hermia has been promised to Demetrius.
Hermia and Lysander are found in the woods.
Helena's plan to follow Demetrius into the woods and make him fall in love with her is failing so far.
Robin Goodfellow fixes Demetrius
The weather in Athens is out of sorts. The king and queen of the fairies fight over a changing Indian boy and peace between them does not look close at hand.
Oberon charms Titania into giving him the child.
Now that Demetrius loves Helena, Hermia and Lysander are allowed to marry.
Robin negates the love potion and reapplies the potion so that he will fall in love with Helena.
Oberon put the love potion on Titania's eyes, made her fall in love with Nick Bottom who at the time had a donkey head. He then black mailed her into giving him the child and in exchange he would remove the potions effects and all is well.