Literary critic Northrop Frye points out that the Elizabethan calendar still only recognized three seasons in the year, "summer, autumn, and winter" ("Mythological Background"). He further states that summer included spring and began in March thereby placing May in the middle of summer and May Day as the mark of midsummer.

We know that most of the action of the play takes place on May Day eve because, the morning after the night in the woods, Theseus finds the four lovers asleep in the forest and remarks:

No doubt they rose up early to observe The rite of May; and, hearing our intent,
Came here in grace of our solemnity(IV.i.132-133).

Hence, if the play is set between May Day eve and May Day, then we know that the action of the play indeed takes place in midsummer.

Frye also points out that May Day eve was traditionally recognized as one of the "haunted 'eves'" of the year, the first being All Hallows' Eve. May Day eve was a night on which Elizabethans believed that spirits were around, and those spirits could be either "benevolent or malignant" ("Mythological Background"). Hence, it makes perfect sense that Shakespeare made use of both the mischievous actions of fairies and the beneficial actions, as we see through both Puck and Oberon.

Thus, the title A Midsummer Night's Dream is fitting because the action of the play takes place in midsummer, and May Day eve was also believed to be a haunted night.

Shakespeare's A Midsummer Night's Dream is about love, dreams, and perceptions of reality (and, by extension, perceptions of the fantastical). These ideas manifest themselves in a variety of ways: young lovers chase each other through a Greek forest and become entangled in the misplaced magical schemes of fairies, while "rude mechanicals" bumble about and struggle to practice a crude play-within-a-play. It is a story where nothing is as it seems, reality is a dreamy haze, and love dominates drowsy psyches.

It's hard to say exactly how these ideas make the play enjoyable to read, especially since different readers will find different aspects enjoyable (I, for one, think that Bottom is one of Shakespeare's most ingenious creations). It's possible to guess that the play's dreamy atmosphere, preoccupation with mischievous fairies and quarreling lovers, and commentary on the nature of narrative, are above all funny. Indeed, A Midsummer Night's Dream is probably one of Shakespeare's funniest plays, as its fantastical nature conjures some truly hilarious scenes. As such, though it's hard to say with objective certainty why the play is enjoyable, it's possible to guess that the dream-like atmosphere and the depiction of love's complications are quite simply funny to read or watch.