I wish that they had a more specific cause, say, increased support for NSF, NIH, NOAA and NASA. When you have a polarizing and egomaniacal figure like Dawkins headlining an event supporting "reason" instead of "science", I think it may come off as a little bit crass and condescending. Still, I totally get their point, and I would probably attend if I were in the DC area.
I suppose you're right. I like to play devil's advocate sometimes to get a conversation going. Truthfully, I agree with Dawkins et al most of the time. Although, if Eddie Izzard is speaking, I would love to see him use logic and reason to explain his cross dressing. Some things just feel right to some people, I guess; reason has nothing to do with it.