The Symposium (Greek: Συμπόσιον) of Xenophon, is a dialogue set at an Athenian dinner party attended by Socrates. The work is not of the same philosophical depth as Plato's dialogue of the same name and theme, but it may be a more realistic depiction of the intellectual atmosphere among the aristocracy of classical Athens. The dramatis personae include a number of historical figures such as Antisthenes, the founder of the Cynic school of philosophy and Charmides, the central character of another socratic dialogue by Plato.
Free Online Texts
Gutenberg: The Symposium. Multiple formats.
Wikisource: Symposion, English translation by H.G. Dakyns. Downloads via Book Creator.
University of Adelaide (Internet Archive): Symposium. English translation by H.G. Dakyns. Multiple formats.
BBC Radio 4 In Our Time: Xenophon. Melvyn Bragg with Paul Cartledge, Edith Hall and Simon Goldhill.
History of Philosophy without any gaps: Socrates without Plato: the Accounts of Aristophanes and Xenophon - podcast.
Internet Encyclopedia of Philosophy: Xenophon.
Wikipedia: Symposium (Xenophon).
The Great Conversation: Further reading at Tom's Learning Notes.
Ancient Greek resources: Learn to read Greek classics in the original.