>class Event(models.Model):
>somefield
>somefield
>reminder=models.IntegerField('Reminder', default=0, choices=REMINDER_STATUS)
>reminderx = models.IntegerField('Days',blank=True, null=True)

today = date.today()
    a = Event.objects.filter(del_f=0)
    is_today = []
    is_week=[]
    is_custom =[]

    for i in a:
        print('i:',i)
        reminder = i.reminder

        if reminder == 1 :
            rtoday = i.start_date.date() - timedelta(days=1)
            print('rtoday:',rtoday)
            if rtoday == today:
                is_today.append(i)
        if reminder == 2 :
            rweek = i.start_date.date() - timedelta(days=7)
            if rweek == today:
                is_week.append(i)

        if reminder == 3 :
            reminderx = i.reminderx
            rcustom = i.start_date.date() - datetime.timedelta(days= reminderx)
            if rcustom == today:
                is_custom.append(i)

    context['today'] = is_today
    context['week'] = is_week
    context['custom'] = is_custom

    return context