The first closed beta event for End of Nations will take place starting on Friday, July 20th at 12:01am Eastern and last through Sunday, July 22nd at 11:59pm Eastern. That ought to give you plenty of time to sign yourself up for this (*deep breath*) free-to-play, massively multiplayer online real-time strategy game.
Details on what this event is going to include weren't exactly in-depth, but we do know that it'll feature small and large maps across multiple terrains, with a "wide range" of units to upgrade.
Trion and developer Petroglyph Games are also pushing a $29.99 Founders Edition for End of Nations which packs in the usual exclusive skins, in-game credits, boosts, and more. That's certainly one way to get into these closed betas.