It seems to me that the root cause of the original poster's situation was twofold.
1) Not doing a proper NOTAM briefing before departure - I suspect the flight time was not set in SkyDemon.
2) Overreacting to an informational NOTAM. It's unlikely that this was actually restricted airspace - it was probably just warning of intense activity. That being the case, just keeping a good lookout would have been preferable to entering IMC!