What is the mood as Act 3, Scene 1 opens in a midsummer nights dream?

I would say that the mood at the beginning of this scene is pretty comic.

This scene opens with the players (led by Bottom) talking about how they are going to do their play.  This gives Bottom a good chance to be a clown.  He starts talking about concerns he has about how the play will go.  As he does this, he tells a lot of jokes and generally acts silly.  For example, he talks about how the ladies will be afraid of the lion.  He then says that there is no wildfowl that is more frightening than a lion.