Apex of Legends has three types of events: Season Launches, Themed Events, and Collection Events. The Collection Events may feature small-town changes or town takeovers. That type of event presents event challenges where all players can earn or purchase (limited or not) cosmetics.
Apex Legends Fight or Fright Collection event it's made for Season 3 and starting from October 15 and ending on November 5. The event includes challenges and limited cosmetics. A limited-time game mode is introduced during this event. That game mode is called Shadowfall, and it is available from October 15 till November 1. In this type of game mode, 35 solo players drop into a night-time version of the abandoned Kings Canyon (map on Apex Legends located in the planet Solace). When a player gets killed, they become a Shadow, who then gains increased speed and has stronger melee attacks and no after death respawn time. The only form of attack Shadows have is a melee attack (150 damage). They can not use abilities, pick up weapons or items, but they can scale walls and get unlimited respawns via skydive. The Shadows must turn against the remaining legends/players before they run away. When Legends are only ten, they have to manage to escape Kings Canyon, or the Shadow Squad will win. The 35 legends are solo until their number goes down to 10. When they are only ten, they become a team and have to make it to an evac ship, in order to win. If any of those last 10 players die, they do not become Shadows, but they also don't share the victory if their teammates manage to escape. All players can see the location of every death with markers for Legend deaths and Shadow deaths.
You can find supply bins throughout the map (big metal containers). Some of them are filled with spiders and zombies that jump out whenever the bin is opened. So you never know if it is a trick or a treat until you actually open it. These supply bins carry between 1 and 3 items ranging from healing items, grenades, armor, or weapons and their respective ammo.
There are a lot of Event Challenges during Fight or Fright, from which you can earn free badges, music packs, and skins. You get a Music Pack after your first login during this event. After you kill one Shadow in Shadowfall, you get Badge – Tier 1. Killing 50 Shadows in Shadowfall will give you Badge – Tier 2. For Badge – Tier 3, you need to escape on the Drop Ship 25 times. The loot bins with spiders and zombies are actually pretty helpful because after you kill 25 loot bin spiders or zombies in Shadowfall, you can get R301 Weapon Skin. To earn Octane Legend Skin, you should kill 50 Legends in Shadowfall (if you team up with the other Shadows, you can complete this one more leisurely). Devotion Weapon Skin will be yours after you win as both a Legend and a Shadow. Completing 20 daily challenges will get you the Alternator Weapon Skin. This whole event is full of loot, some of it is exclusive stuff, and one should definitely give it a try.