Fallout '76's Halloween event this year is Mischief Night, letting you take full advantage of the day to wreak utter havoc on Whitespring. Mischief Night kicks off at noon EST on October 26 and runs until the same time on November 5, and it begins "every hour, on the hour." It's a public event, which means free fast travel too.
You'll start off at the Mischief Pyre near the Springhouse Gazebo, and after hearing about the rogue Eyebot JES-2R's dark plans, you're in for a quick tour of the resort area.
From there, you can destroy property and vehicles, vandalize buildings, risk getting tricked at one of the treat bowls, and basically do whatever your little black heart desires — as long as the Whitespring Elite Security Force doesn't catch you.
Complete JES-2R's missions to earn rewards, and wearing or crafting your own costume helps further your progress towards unlockables.
Check out the full details here.