Act Three of Much Ado About Nothing....

Act Three Scene One - The Orchard

There is also clever wordplay between Beatrice and Benedict.
The plan to make Beatrice fall for Beneick is under way
The plan to make them fall for each other has worked as they've fallen for it.( Another Jesty yet light conspiracy between the Characters, that also carries the development of the play as it carries on between the characters.
There is the mix of some Dramatic Irony, were the readers know more about the play that the Characters within the play, in obvious sense that Shakepeare has completed the purposes of the story he wishes to depict.
Trickery towards Beatrice loving Benedict is put into play, She falls for it.

"what fire is in mine ears? Can this be true?

Stand i condemned for pride and scorn so much?

Contempt, farewell!And maiden pride, adiue!

No glory ive behind the back of such.

And, Benedick, love on; i will requite thee,

Taming my wild heart to thy loving hand.

If thou dost love,my kindness shall incite thee

To bind our loves up in a holy band:

For others say thou dost desrve, and I

Believe it better than reportingly".

Onto Act Three Scene 2

Claudio is elated about his upcoming marraige to his love - Hero

This is also the Scene where the climax takes place and Don John seeing an opening adds fuels to the flames, he approaches his brother - Claudio innocent in this matter, and by using their Don Pedro and his trusted friend, thier friendship remains the key to unlocking the chaos that awaits in the development of the play.

With the stage set and chaos commencing in the heart of claudio, it starting seeping out. The Clown Characters - The Idiots, are introduced to the play.- Dogeberry and Verges.

But then again they are also the key to unravelling the plots set by Don John and his evil minions as we find out later on within the course of the play. They have already captured Borachio and Conrade and have tortured them into telling them all that those two conspired with their master.

Act Three Scene Four and Five

The loved up Hero begins preparations for her up wedding day safely in the room, unaware that beforehand the plan devised by Don John has played the trick on her bethrothed husband Claudio.

this is another instance where the audience experiences Dramatic Irony, where they know the development of emotions of the characters and Claudio's plan to embarass Hero at the alter on their Wedding Day but leaving the characters unaware of this fact.

The audience should also by this point of the play sense the building tension, and this being more evident when the two - Verges and Dogeberry fail to state what it was they wished to tell Leonato, which was the reason they went to his house in the first place.