[1] And thus, in modern writing, generally called 'Plato Comicus' to differentiate him from the philosopher. K.J. Dover, in OCD4 under Plato(2), gives a brief account of him. A longer account in Rosen [below] is less a biography than an attempt to locate him in the juncture between Old Comedy -- as in the first four contemporaries named here -- and Middle Comedy. Kassel & Austin, PCG 7.431-548, cite 303 fragments. On Old and Middle Comedy see generally web address 1 and web address 2.
[2] The Suda in fact gives thirty titles -- not including the three alleged by Athenaeus! For the subjects of some of these titles see Norwood (below) 165-177, and the Index Locorum in Dobrov (below) 551, which will guide the reader to the references in the various scholars in the collection. For references to named plays of Plato Comicus in the Suda see under e.g. alpha 3097 (Ambassadors), alpha 3824 (Peisander), alpha 4353 (Phaon), alpha 4635 (Adonis), and sigma 814 (Sophists). None give any indication of the plot.
[3] Athenaeus' Deipnosophists, a second century CE work imitating the philosopher Plato's Symposium: see alpha 731, and Arnott 2-8 in Dobrov. OCD4 s.v. says Athenaeus cites 1,250 authors, gives the titles of more than 1000 plays, and quotes 10,000 lines of verse. In the present instance the passages are 7.279A & C [7.9 Kaibel] for Swindler and Mankiller; note, however, Casaubon's emendation from 'Platon' to 'Baton' in both passages. Festival Celebrants is *not* mentioned by Athenaeus, but many in the first paragraph here are.