https://www.pcgamer.com/endless-space-2-and-endless-legend-tease-new-expansion-footage-announce-free-weekend/

This time last week, we learned of Endless Space 2 and Endless Legend's new Supremacy and Inferno expansions—both of which land today. This time this week, I'm here to tell you both games are getting a free weekend. 

From now through Sunday at 10am PST / 6pm BST, Endless Space 2 and Endless Legend are free to try (as are Amplitude's other games Dungeon of the Endless and the original Endless Space). More on that features in the trailer above. If you already own all of the developer's games, the free weekend's custom-made website and stretch goals might be of interest.