All programming conferences are C conferences, if you think about it.
What on earth are you talking about? Assembly. Java. Ruby. Python. The list goes on. Could you explain your rationale behind this statement?
If programming is turtles all the way down, C is the bottom turtle, standing on the solid ground of Von Neumann architecture.
The point is, C is utterly pervasive. Everything that we think is different from C is made from C.