Despite their rigid structure, Ancient Greek plays resonate in whatever era they are presented. Gods and demigods dealt with the same jealousy, conflict, passion, and humor mortals encounter in the real world.  These powerful emotions are the centerpieces of two festivals:  The Third Annual Onassis  Festival, "Birds: A Festival Inspired by Aristophanes", offers Nikos Karathanos’s magical production of the comedy at Brooklyn co-producer St. Anne's Warehouse, and The Seeing Place Theater's "Whistleblower Series" at the Lower East Side Paradise Factory features Brandon Walker's timely and provocative recreation, The People vs. Antigone. "Where are the birds?"  Pisthetaerus (Nikos Karathanos) and Euelpides (Aris Servetails) ask each