What is the most important part of Act 2, Scene 1 in A Midummer Night's Dream?

 A Midsummer Night’s Dream presents us with three worlds:
The court world of Athens, the fairy world of the wood and the world of the
artisans.  In act 2.1, we are introduced to the king and queen of the fairies squabbling
over a challenging page boy, from whom Titania refuses to separate. In fact, their
dispute is sufficient to cause disorder and chaos in the world around them, as we can
see in the following lines:

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“And throughout this distemperature we
see

 The seasons alter: hoary-headed
frosts

 Fall in the fresh lap of the crimson
rose…

The spring, the summer, the chiding autumn, angry
winter change…”

 Another
important aspect in act 2.1 involves the Athenians, Demetrius and Helena, who cross the
thresholds of the court and the wood. Demetrius is following Hermia with whom he is in
love and Helena is after Demetrius, who disdains her. What is important here is that
once in the wood, the human characters become vulnerable. In effect, the love portion
used by Oberon to revenge the fairy queen will also challenge the young
Athenians.

Thus, I think that the whole act 2.1 is
important because we are introduced to the world of the wood, in which most of the
action takes place and where the midsummer dream can be carrying out by the young
Athenians and the “rude mechanicals”.