thanks, Brian

I see that "Mischief Night" is also known as "Cabbage Night"
https://en.wikipedia.org/wiki/Mischief_Night
Scottish Gaelic - Oidhche nan Cleas - night of the tricks

The following is quoted from Heather Whipps' article in https://www.livescience.com/5149-devil-night-history-pre-halloween-pranks.html:

The most ancient roots of Halloween come from the Celts of Great Britain, who believed that the day before their Nov. 1 New Year was a time when spirits came back to haunt and play tricks. On Oct. 31, people dressed up in scary costumes, played games, lit bonfires and left food out on their doorsteps for the ghosts in celebration of this otherworldly event, which the Celts called Samhain.

When Great Britain was Christianized in the 800s, the ghoulish games of Samhain merged with All Saints Day and All Souls Day, during which the dead were honored with parades and door-to-door solicitation by peasants for treats — usually a bit of food or money.

After the Protestant Reformation, much of England stopped the "treating" side of Halloween because it was connected to Catholic saints, and transferred the trickery to the eve of Guy Fawkes Night, a Nov. 5 holiday celebrating the foiling of the 1605 Gunpowder Plot to blow up British Parliament. Mischief Night in England is still celebrated on Nov. 4.

The Irish, Scottish and northern English, meanwhile, kept up much of their Halloween traditions, including the good-natured misbehavior, and brought their ways to North America with the wave of immigration in the 1800s.

Before the 20th century, Halloween mischief in the United States and Canada happened on Oct. 31 and consisted of tipping over outhouses, unhinging farmer's gates, throwing eggs at houses and the like. By the 1920s and 30s, however, the celebrations had become more like a rowdy block party, and the acts of vandalism more serious, probably instigated by tensions over the Great Depression and the threat of war, historians say.

To stem the vandalism, concerned parents and town leaders tried to ply kids with candy, encouraging the forgotten tradition of trick-or-treating in costume in exchange for sweets, bumping the mischief element from the celebrations of Oct. 31 altogether. It was then that the troublemakers, neighborhood by neighborhood, adopted Oct. 30 as their day to pull pranks. Rotten vegetables

The custom of vandalism on Oct. 30, oddly, seems to have only developed sporadically, often appearing in some areas but not at all in others nearby.

Nowadays, Mischief Night is especially popular in pockets where Irish and Scottish immigration was common — in northeastern United States but not in the South and West, for example, and in the English-speaking communities of Canada but not the French. Examples of the regional varieties include:

    Cabbage Night in parts of the northeastern United States, where rotten vegetables are collected and left on porch stoops or smeared on doors and windows.
    Mat Night in English-speaking Quebec, where pranksters steal doormats and switch them with the neighbors'.
    Gate Night, in the Midwest, where farmers gates are opened, leaving livestock to roam free.

Other popular pranks include the ubiquitous toilet-papering of homes and trees, "soaping" cars and windows and pumpkin smashing.