Halloween is a imported holiday where I live. A lot of people seem to confuse it with
carnaval and wear carnaval costumes
Here is Spring btw, so I don't know if the spookiness fit with the season lol
In shops that sell stuff to parties and costumes they sell Halloween themed stuff to try to gain money with the holiday and in schools and language schools they celebrate, but it's not much popular.
Here a similar holiday is
Cosmas and Damian in 27/09, where people give candy to kids, but you don't need to wear a costume or anything, and it's during the day so a lot of kids skip school to go get free candy lol Since Cosmas and Damian are saints, protestants don't like the holiday, so they give candy in the children's day on 12/10 (that is also a national holiday because it's also Our Lady of Aparecida day).
Also, most shops don't sell Halloween themed stuff, so they just start decorating/preparing for Christmas after children's day.
There is also the proclamation of republic, which is a national holiday in November, but no one celebrates that lol
I hope you liked my trivia