Why wont my event run more than once?

local player = game:GetService("Players").LocalPlayer
local status = game.ReplicatedStorage.StatusBar:WaitForChild("Status")
local intermissionLengthInSeconds = game.ReplicatedStorage.StatusBar.IntermissionTime.Value
--codeblock 1
function LobbyStart()
for i = 1,intermissionLengthInSeconds do
wait(1)
intermissionLengthInSeconds = intermissionLengthInSeconds - 1
status.Value = "Intermission " .. intermissionLengthInSeconds
end
--codeblock 2
if intermissionLengthInSeconds < 1 then
	status.Value = "Round In Progress"
	game.Workspace.Lobby.Lobby.SpawnLocation.Position = Vector3.new(-376.163, 20.572, 48.294)
	intermissionLengthInSeconds = 10
end
end
LobbyStart()
-- codeblock 3
game.Workspace.NPCs.Innocent.Humanoid.Died:Connect(function() 
	status.Value = "Intermission " .. intermissionLengthInSeconds
	game.Workspace.Lobby.Lobby.SpawnLocation.Position = Vector3.new(-415.437, -160.351, 63.309)
	game.Workspace:FindFirstChildOfClass("Model").Head:Destroy()
	LobbyStart()
end)

at codeblock 3 How do I make the event run every time the NPC die's, cause when the NPC die's he respawn's in a new model so the code will stay connected with the dead NPC. if you know what I mean

GENERAL PRACTICE

Use :WaitForChild() to make sure a part or model exists before defining or changing it.

Use :GetService() to retrieve the ReplicatedStorage Service

Use workspace rather than game.Workspace

You don't require the spaces when using .. in a string

ISSUES

Defining "intermissionLengthInSeconds" as a value procludes you from changing it afterwards since your initial definition is a pre-set number, so you need to use .Value to be able to change it afterwards.

As you said, your problem is that the code is only linking to a single NPC, the one that starts in the game. However, I propose using the ChildAdded event to create the Died Event by checking that a new child (presumably a clone) is added to the "NPCs" Folder / Model and that the "child" is named "Innocent"

In order for the death function to work for the first "Innocent" you can add the model to ReplicatedStorage and clone it into the "NPCs" Folder / Model when the player first joins the game.

REVISED LOCAL SCRIPT

local player = game:GetService("Players").LocalPlayer
local bar = game:GetService("ReplicatedStorage"):WaitForChild("StatusBar")
local status = bar:WaitForChild("Status")
local length = bar:WaitForChild("IntermissionTime")
local spawnloc = workspace:WaitForChild("Lobby"):WaitForChild("Lobby"):WaitForChild("SpawnLocation")
local npcfolder = workspace:WaitForChild("NPCs")

local function LobbyStart()
	local clone = game:GetService("ReplicatedStorage"):WaitForChild("Innocent"):Clone()
	clone.Parent = npcfolder

	for i = 1, length.Value do
		wait(1)
		length.Value = length.Value - 1
		status.Value = ("Intermission "..length.Value)
	end

	if length.Value < 1 then
		status.Value = "Round In Progress"
		spawnloc.Position = Vector3.new(-376.163, 20.572, 48.294)
		length.Value = 10
	end
end

LobbyStart()

npcfolder.ChildAdded:Connect(function(child)
	if child.Name == "Innocent" and child:IsA("Model") then
		child:WaitForChild("Humanoid").Died:Connect(function() 
			status.Value = ("Intermission "..length.Value)
			spawnloc.Position = Vector3.new(-415.437, -160.351, 63.309)
			LobbyStart()
			child:Destroy()
		end)
	end
end)

I presume the :Destroy() on a model was to kill the player, but if you use the :Clone() function this wouldn't be required since the clone automatically is recreated.

If it isn't then you won't require line 33 and can move the cloning outside of the local function like so

local player = game:GetService("Players").LocalPlayer
local bar = game:GetService("ReplicatedStorage"):WaitForChild("StatusBar")
local status = bar:WaitForChild("Status")
local length = bar:WaitForChild("IntermissionTime")
local spawnloc = workspace:WaitForChild("Lobby"):WaitForChild("Lobby"):WaitForChild("SpawnLocation")
local npcfolder = workspace:WaitForChild("NPCs")

local clone = game:GetService("ReplicatedStorage"):WaitForChild("Innocent"):Clone()
clone.Parent = npcfolder

local function LobbyStart()
	for i = 1, length.Value do
		wait(1)
		length.Value = length.Value - 1
		status.Value = ("Intermission "..length.Value)
	end

	if length.Value < 1 then
		status.Value = "Round In Progress"
		spawnloc.Position = Vector3.new(-376.163, 20.572, 48.294)
		length.Value = 10
	end
end

LobbyStart()

npcfolder.ChildAdded:Connect(function(child)
	if child.Name == "Innocent" and child:IsA("Model") then
		child:WaitForChild("Humanoid").Died:Connect(function() 
			status.Value = ("Intermission "..length.Value)
			spawnloc.Position = Vector3.new(-415.437, -160.351, 63.309)
			workspace:FindFirstChildOfClass("Model"):WaitForChild("Head"):Destroy()
			LobbyStart()
		end)
	end
end)