There are no comprehensive concert guides (that I'm aware of). I think that basically one has to stay on top of all the different guides in addition to keeping an ear out for upcoming shows. That said, here are a few good references:
As to poor promotion? Well, get used to it!
It's important to be proactive here if you want to be aware of all that's potentially going on (usually a lot). I hope you don't miss the next one...