[Senkusha]

So, this date apparently appears in A LOT of movies.  Does anybody know of the significance of it?  What's your thoughts on this?  Conspiracy theory or possible warning?

[Ken]

I think they're either release dates or the 1st day of the fall season.

[Senkusha]

Mabon is the name of the first day of Autumn.

[ZandraJoi]

Did you find out anything?
I looked into this but just found the opposite in:
https://en.wikipedia.org/wiki/Dump_months
"The dump months are what the film community has, before the era of streaming television, called the two periods of the year when there have been lowered commercial and critical expectations for most new theatrical releases from American filmmakers and distributors....
January[1] and February are usually most commonly described this way, with August and September sometimes included. ...."

[Senkusha]

No, I haven't really looked into this further.