Black Friday certainly is an idea, but I caution doing anything in or near the City of Angeles when the masses are not either working or standing in some type of entitlement line seeking their handout. Black Friday is usually considered a holiday for many and that could well translate into a full range....perhaps this issue can be overcome by reserving a section of the range for private exclusive use?? Barring that exception....
I would suggest we choose a day mid week and specifically not around a holiday. Granted we may loose some M14 dedicated shooters to the plague called work but the masses are not to be underestimated. My experience has been the masses are rude, inexperienced and pumped full of testosterone trying to impress that double breasted mattress thrasher that accompanied them to the range. I see my myself avoiding this event if it is scheduled at a time convenient to the masses.
My vote would be a Thursday, date of your choosing. NoExpert you might want to post the range hours since many, myself included will be traveling for a long distance.