generate the python tkinter code for the following functions: CHECK$\_$FOR$\_$EXISTING$\_$EVENT, ADD$\_$EVENT, SAVE$\_$EVENT, VIEW$\_$EVENT, EDIT$\_$EVENT, and DELETE$\_$EVENT, and ensure to incorporate DATA VALIDATION on the functions that need it $($ ADD$\_$EVENT & EDIT$\_$EVENt$)$ A listbox is used to contain and highlight the events, entry boxes are used to gather the TITLE, TIME, and DESCRIPTION of the events and they are contained on the second window: the EVENT MANAGEMT WINDOW, and a calendar widget is used to gather the DATE. The following code is what I have generated so far, Please USE IT to develop the functions and other details mentioned. Thank you.

import tkinter as tk

from tkinter import ttk

from tkcalendar import Calendar

from PIL import ImageTk,Image

import datetime

from tkinter import simpledialog

class EventManagementWindow$($tk$.$Toplevel$)$:

def $\_\_$init$\_\_($self$,$ parent$)$:

super$().\_\_$init$\_\_($parent$)$

self.config$($background$=$"dodgerblue$1")$

self.title$(\text{'}$Event Management'$)$

self.geometry$(\text{'}900$x$800\text{'})$

self.parent $=$ parent

self.create$\_$widgets$()$

def add$\_$event$($self$)$:

if event$\_$name and event$\_$date:

# Check if the event already exists

if f$"\{$event$\_$date$\}$: $\{$event$\_$name$\}"$ in self.event$\_$listbox.get$(0,$ tk$.$END$)$:

tk$.$messagebox.showerror$("$Error$",$ "This event already exists."$)$

else:

self.event$\_$listbox.insert$($tk$.$END, f$"\{$event$\_$date$\}$: $\{$event$\_$name$\}")$

self.parent.highlight$\_$event$($event$\_$date$)$

def edit$\_$event$($self$)$:

selected$\_$index $=$ self.event$\_$listbox.curselection$()$

if selected$\_$index:

current$\_$text $=$ self.event$\_$listbox.get$($selected$\_$index$)$

new$\_$event$\_$name $=$ tk$.$simpledialog.askstring$("$Edit Event", "Enter new event name:", initialvalue$=$current$\_$text.split$(\text{'}$: $\text{'})[1])$

if new$\_$event$\_$name:

# Check if the new event already exists

if f$"\{$current$\_$text.split$(\text{'}$: $\text{'})[0]\}$: $\{$new$\_$event$\_$name$\}"$ in self.event$\_$listbox.get$(0,$ tk$.$END$)$:

tk$.$messagebox.showerror$("$Error$",$ "This event already exists."$)$

else:

self.event$\_$listbox.delete$($selected$\_$index$)$

self.event$\_$listbox.insert$($selected$\_$index, f$"\{$current$\_$t

class MainWindow$($tk$.$Tk$)$:

def $\_\_$init$\_\_($self$)$:

super$().\_\_$init$\_\_()$

self.config$($background$=$"azure$3")$

self.title$("$Calendar$")$

self.geometry$("900$x$600")$

self.create$\_$widgets$()$

self.events $=\{\}$

def create$\_$widgets$($self$)$:

self.calendar $=$ Calendar$($self$,$ selectmode$=$"day",

year$=$datetime.datetime.now$().$year,

month$=$datetime.datetime.now$().$month,

day$=$datetime.datetime.now$().$day,

font$=("$Arial Black", $16,$ "bold"$),$

background$=$"dodgerblue$1",$

foreground$=$"Black",

headersbackground$=$"firebrick",

headersforeground$=$"Black",

selectforeground$=$"darkslategray$4",$

selectbackground$=$"yellow",

weekendforeground$=$"Black",

weekendbackground$=$"dodgerblue$1",$

othermonthforeground$=$"darkslategray$4",$

othermonthbackground$=$"gainsboro",

disabledforeground$=$"Black",

disabledbackground$=$"dimgray"$)$

self.calendar.pack$($pady$=20)$

self.manage$\_$events$\_$button $=$ tk$.$Button$($self$,$ text$=$'Manage Events', activebackground$=$"yellow", background$=$"dodgerblue$1",$ font$=("$Arial Black", $10,$ "bold"$),$ width$=12,$ height$=3,$ command$=$self.open$\_$event$\_$management$)$

self.manage$\_$events$\_$button.pack$()$

# Create the exit program button

self.quit$\_$button $=$ tk$.$Button$($self$,$ text$=$"Exit Program", activebackground$=$"yellow", background$=$"firebrick", font$=("$Arial Black", $10,$ "bold"$),$ width$=10,$ height$=3,$ command$=$self.quit$)$

self.quit$\_$button.pack$($side$=$"bottom", anchor$="$e$",$ padx$=10,$ pady$=10)$

def open$\_$event$\_$management$($self$)$:

self.event$\_$management$\_$window $=$ EventManagementWindow$($self$)$

def highlight$\_$event$($self$,$ event$\_$date$)$:

if event$\_$date not in self.events:

self.events$[$event$\_$date$]=$ self.calendar.calevent$\_$create$($date$=$event$\_$date, text$=$'Event', tags$=$'highlight'$)$

self.calendar.tag$\_$config$(\text{'}$highlight$\text{'},$ background$=$'orange', foreground$=$'black'$)$

def unhighlight$\_$event$($self$,$ event$\_$date$)$:

if event$\_$date in self.events:

self.calendar.calevent$\_$remove$($self$.$events$[$event$\_$date$])$

del self.events$[$event$\_$date$]$

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

app $=$ MainWindow$()$

app.mainloop$()$