HELP PLS How does the complicating incident of act 1 of A Midsummer Night's Dream affect the plot?

Hipployta agrees to marry Theasus, so all the characters must come together in the same place

Oberon decides to put a spell on Titania, which causes her to fall in love with Bottom.

Theseus tells hermia she must marry Demetrius or die, so Hermia asks her friend Helena to hide her from Theseus

Lysander and Hermia decide to run away, which brings the four lovers and fairies together in the woods