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What a nice idea and nice way to spend time with your kids! I got hooked. Here is a bit different approach to get more dates to get spooked :-)

I heard quite a few stories when people woke up in the middle of the night from a nightmare just to see how the "huge full moon" was staring at them through the window and get a bit more spooked :-) Or how "enormous that full moon was above horizon". Interestingly enough in many cases the day before or the day after the instant called "full moon" will give people same visual and emotional impressions, because the moon size is almost identical visually. See the 3 images below for the days before, during and after full moon.

So the idea is that people are not usually impressed by a calendar date but by the full moon size and sight. So I thought I will find al those FRI 13th days that land not only the day of fool moon, but also the day before or after. Beware these things depend on TimeZone -- that you might want to set like DateObject[{year, 10, 13}, TimeZone -> -8] for example. Wolfram Language often picks up your TimeZone automatically. So different people data might be a bit different.

@David That is very inspiring. I have a son in the same age of your daughter and I have been slowly showing him some tricks to do with WL and W|A. Does your daughter fully understand that code? cause I am going much slower with my son and I am not sure if he can handle it if I go faster. Thank you for sharing this.

Nice! As a child I was injured on a Friday the 13th in October and was amused that it happened on such an unlucky day. Now I know it was also a full moon!

@Ahmed,

She does not fully understand that code. I told her what it does and went a little more into depth on MoonPhase[] (because I think it's so cool!), but as far as reading the code, she understood using Table[] on the friday13thfullmoon[] function.

Definitely keep going slow, it helps in my opinion. We started EIWL in June of this year and are only just now in the chapter that introduces Manipulate[]. That includes doing it once or twice a week, with frequent multi-week breaks. On days we do lessons she will re-watch the video for the chapter, and then do 1-4 problems for that chapter, usually with heavy assistance with me (especially for formatting like reminders to place a comma or close a bracket).

@Jeremy,

Yes Graphics and Colors are where kids get interested, much more than the math-y stuff! I think it's great to show some of the code behind an app.

I'm looking forward to getting to the EIWL chapter on using CloudDeploy[] since we'll be able to start making apps that she can use outside of the programming lab environment and maybe share with her friends

And I'd love to help with a book, I'll start keeping better notes!

Thanks David, this clears things up. Thank you again for sharing your experience. Looking forward for more from you in the future.