Probably not as common but the last 15 miles of Day 1 on Ride the Rockies this year would qualify as suffer fest in my book. While those miles were downhill the temps were in the low 30s, there was snow sleet and rain, I was doing lots of braking to keep from going too fast on the curves and it was as cold as I've ever been on a bike. I was shivering uncontrollably and was absolutely miserable.

As I think about it most of my other suffer fests have either involved wind that you have on your list, or riding with a fast group that continuously has me on the edge of my limits.

I guess Time Trials might just qualify as suffer fests as well. When you feel like you need to throw up after you've ridden that is probably one of the defining qualities.