Festival of the Dead is held by many cultures throughout the world in honor or recognition of deceased members of the community, generally occurring after the harvest in August, September, October, or November (Autumn season).. 
In Japanese Buddhist custom the festival honoring the departed (deceased) spirits of one’s ancestors is known as Bon Festival. 

In Inca religion the entire month of November is ‘Ayamarca’, which translates to Festival of the Dead.

In the 21st century, European traditions mark the celebrations of Halloween, All Saints and All Souls’ Day.

In many cultures a single event, Festival of the Dead, lasting up to 3 days, was held at the end of October and beginning of November; examples include the Peruvians, the Pacific Islanders, the people of the Tonga Islands, the ancient Persians, the ancient Egyptians, the Japanese, ancient Romans, and the northern nations of Europe. 

For the Hindus the ritual done for the dead ancestors is called Pitru Paksha. It is based on the Hindu lunar calendar and the period lasts for 15 days. 

The dates change as per the Hindu lunar calendar.
Such acts of worshiping many gods or deities & festivals were forbidden in the Hebrew culture (Religion of Judaism) due to their rituals practices which could invoke the human body and nature with various energies which can stimulate and stir up the negative animalistic or immoral traits in the human soul.

Article taken from wikipedia.org