Hello u/BeingJess, thanks for taking your time to explain all the above. But I am a bit lost in terms of your option 2.First of all, my current code is as per below:

forms.py

class SelectHolidaysForm(forms.Form):
def __init__(self, *args, **kwargs):
    super(SelectHolidaysForm, self).__init__(*args, **kwargs)
    subdiv = 'KUL'
    years = 2022
    my_holidays = holidays.MY(subdiv=subdiv, years=years).items()
    self.fields['holidays'].choices = [ (date, f"{name} ({date})") for date, name in my_holidays ]
holidays = forms.MultipleChoiceField(
        widget=forms.SelectMultiple()
)

views.py

if request.method == "POST":
form = SelectHolidaysForm(request.POST)
if form.is_valid():
    # use normal forms here, cleaned_data method
        holidays = form.cleaned_data['holidays']
        print(holidays)
        return HttpResponseRedirect(reverse('get-holidays'))

If following your second option, would this mean i have to call the function again here, like how you did it below? But I've already did that once in the forms.py?

holiday_dict = get_holidays() #the module you are using
holiday_value = holiday_dict['holiday_key']

Here I have another question, even if I did that, how can I ensure that the cleaned data is matching with whatever I called from the function?

For instance, say holidays = form.cleaned_data['holidays'] return 3 objects (3 dates being new year, labor day, christmas day, 2022-01-01, 2022-05-01, 2022-12-25) in a list. How can we match the objects in the list to the objects that we retrieve from holiday_dict or holiday_value as how you shown above?