Besides Halloween being on a Saturday this year (yay for sleeping off that hangover on Sunday) we also can expect a rare full blue moon! The moon won’t actually be blue, it’s a title that’s given to the second full moon in a month (which doesn’t always happen).
The last time we had a full moon on Halloween was 19 years ago! Naturally, it would happen on the scariest year we’ve had in a long time (2020, you could be your own Halloween costume)
More info here!