Plato’s dialogue

In Plato’s dialogue, The Symposium, a number of guests gather to drink and sing the praises of the god Eros. Plato presents each speaker in a deliberate order (Phaedrus, Pausanius, Eryximachus, Aristophanes, Agathon, Socrates, Alcibiades). Explain, in detail, why the speakers appear in this order.