One day, one of you non-NOTAM types is going to get yourself or someone else killed. Yesterday, I was flying and my straight line route took me over Silverstone. Normally, nothing more than a convenient visual reference but the NOTAM told me there was a fast jet display so I routed around. Watching the Eurofighter hooning around from five miles away was scary (and impressive) enough, blundering through the middle would at best have got me into big trouble, at worst would have killed me, my twelve year old, an RAF pilot and dozens of spectators. The press and MPs would have us all grounded permanently by the end of the week, ref' hand guns and dangerous dogs.
At my flying club, there is an out-brief system which includes NOTAM, W&B, recency, etc. Ignoring it is likely to get you thrown out and quite right too.
PS the Silverstone display was NOTAMed but not, unless I missed it, the Moto GP which attracted lots of helicopters to the area. I was only warned about that by a motorcycling friend.