I love Civ5, But, it's only fun if you have all of the expansions. You can purchase the complete version on G2A for $13-14.

In terms of a time, this Saturday could be nice.

Game Ideas:
Online Flash-Game Marathon.
TERA (Free)
DoTA2 (Free)
Starbound
Terraria
CS:GO
Unturned (Free)
Don't Starve