Hermias father wants her to marry Demetrius. Although hermia does not love Demetrius she loves lysnader. And her father does not approve of lysander and will not let her marry him.
It was all a dream
The fairies gave Demetrius and lysander a love potion while the both of them were asleep. The potion worked by when the woke up the first person they saw they loved. It created a huge conflict Because Lysander wakes up to Helena and not hermia. And Helena thinks they are mocking her
Fairies come to the rescue
Both men want to marry hermia. Although Hermias father likes Demetrius. So he orders Demetrius to marry hermia. But hermia and lysander both love each other. And they are arguing about hermia.
Happily ever after
All of them fall asleep on there way back to Athens. Though the fairies decide to take away the love potion When they all wake up and everything is back to normal. Lysander and Helena are now getting married
The fairies felt terrible for what they did so they all reversed the love potion on everyone. So everyone went back to loving hermia. Although the put a potion on them thinking it was all just a dream.
They all wake up and think its a dream. Lysander is now back to loving hermia. In conclusion they all are getting to marry who they want to marry.