This is a black-and-white illustration. An adorable bat appears on this Halloween invitation. Enter all of your event information and experiment with fonts and colors, or leave it as is. In either case, this invitation makes a creepy statement. This is a simple template. Halloween has been celebrated for over a thousand years. Originally a religious observance, it gradually became more secular over the centuries until its religious overtones vanished. Today, Halloween is regarded as a holiday for dressing up and having fun, particularly for children. The origins of the Halloween event can be traced back to the ancient Celtic festival known as Samhain, which was held on November 1 in modern calendars.