Appropriate method & science in celebrating Holy festivals

As Holy festivals, Religious festivals and Vowed religious observances have a spiritually scientific base, celebrating those, results in generation of Chaitanya (Divine consciousness) and that helps even an ordinary man to march towards God. Our Holy festivals and Religious festivals are such that they not only give us happiness while alive, but also help our subtle body gain momentum after death. This holy book details how Holy festivals & Religious festivals can be celebrated faithfully by understanding the underlying science, leading to spiritual evolution of those who do so.