Sounds like you did all you could.  Finding a new spot on holiday weekend could be problematic.
I think sites like rvnet help.  If you read this site enough, you'll encounter discussions on generator etiquette, noise, generator hours, battery management, solar and low wattage lighting.   But once in a while you just have to shake your head at the poorly equipped or operated installations.  It is amazing how loud a 4 hp teacup engine can be.  Almost like the entire power output is going into noise.  In these otherwise quiet and beautiful surroundings.