Yeah, this. I've noticed some people in my family / social circle have starting using Evite for event invitations in the past year or so, presumably because they know a lot of people don't check facebook regularly anymore. Functionally though it's neither the same nor as good of a product as FB events. A protocol-based and/or federated solution would be great... but then again people are trying to do this for all the other functions of social media with little success so far. The incentives of capitalism are hard to overcome.