Agreed, this is basically what facebook has, and definitely something I want to imitate eventually. There's already a minimal version in Coracle — if you open an event detail it shows comments on the event. But yeah, coupling a group to an event would be very interesting. 

 yeah true. Id love to pull people away from the nsa’s spyware. Im certain we can offer a far superior experience, especially when you factor in embedded payment for ticketed events via zaps and ecash