PlayerAdded() not triggering, why?

You have forgotten to add the ends:=) LocalScript cannot run if its in workspace

From the roblox wiki:

A LocalScript will only run Lua code if it is a descendant of one of the following objects:

A Player’s Backpack, such as a child of a Tool

A Player’s Player/Character|character model

A Player’s PlayerGui

A Player’s PlayerScripts

The ReplicatedFirst service

wait()
local players = game:GetService("Players")




players.PlayerAdded:Connect(function(plr)

    local player = players.LocalPlayer
    local character = player.Character
local humanoid = character.Humanoid
local hp = character.Humanoid.Health
local maxhp = character.Humanoid.MaxHealth

    print("playeradded")

    if plr == player then

        print("plradded") 

        workspace.Events.DFEvents.PhoenixFruitEvents.ParticlesE:FireServer()
end
end)

here are a few flaws that are are probably leading to errors..

1). You forgot the end keyword, this will lead to a syntax error

2). The code has to be in a server script..

3).you can't use Players.LocalPlayer in a server script..

so here is a example structure that is guaranteed to work:

make sure the code is in server script

local Players = game:GetService("Players")

Players.PlayerAdded:Connect(function(player)
    print(player.Name," has joined the server!")

    --the rest of the code goes here..! 

end)

There are a few things that hinder your PlayerAdded for firing the way you want to.

The first reason is the wait() at the top of your script. This will yield your script and cause the listener to be connected at a later time, which will not fire for when the first player joins.

The second reason is this being a LocalScript. LocalScript connections to a PlayerAdded event will only fire for the players joining after the client.

An additional note, you should also use the event player.CharacterAdded to wait for the character to finish loading.