1st October Zoroastrian: Jashn-e-Mehergan
Jashn-e Mehergan is an Autumn festival, and like NoRuz its origins have been lost in antiquity. Mehergan is dedicated to the divinity Meher or Mithra, who is associated with the sun and with justice.
https://www.spiritualarts.org.uk/jashn-e-mehregan/
2nd October Hindu: Gandhi Jayanti
Gandhi Jayanti, celebrated every year on October 2nd, honours the birth of Mahatma Gandhi, the Father of the Nation in India.
https://www.reonline.org.uk/festivals-calendar/gandhi-jayanti/
3rd and 4th October Jewish: Shemini Atzeret and Simchat Torah
Shemini Atzeret (“the Eighth [day] of Assembly”) is a Jewish holiday celebrated on the 22nd day of the Hebrew month of Tishrei, directly following Sukkot. It is considered a holiday in its own right rather than a continuation of Sukkot; unlike Sukkot, it has no mandated ritual objects such as the sukkah or the Four Species.
Simchat Torah means “rejoicing in the Torah.” This holiday marks the completion of the cycle of weekly Torah readings.
https://www.chabad.org/library/article_cdo/aid/4464/jewish/What-Is-Shemini-Atzeret-Simchat-Torah.htm
11th– 20th Hindu: Sharad Navaratri
Sharad Navratri takes place in the lunar month of Ashwin, typically during September or October. Celebrated across nine nights, it is the most widely celebrated Navratri and is dedicated to the worship of Goddess Durga and her nine divine forms.
https://rrudraksha.com/blogs/blog/sharad-navratri-meaning-history-rituals-spiritual-significance?srsltid=AU7gw4V1CK4k9vOgynLTLz3P973NuxCuiS6R6sv3_dEd1ZWZMPIHjDBO
11th-18thOctober: Interfaith Week of Prayer for World Peace
An annual Interfaith event uniting people from diverse religious background and those with no faith tradition, praying and reflecting on the need for peace in the world.
https://weekofprayerforworldpeace.co.uk/
20th October Sikh: Conferring of Guruship on Guru Granth Sahib in 1708 CE
Before shedding his physical form in 1708 CE, the tenth Guru (Guru Gobind Singh) conferred the status of Guru on the scripture and the scripture is thus called Sri Guru Granth Sahib (SGGS), the eternal Guru of the Sikhs.
https://www.reonline.org.uk/festivals-calendar/conferring-of-guruship-on-the-guru-granth-sahib-by-guru-gobind-singh-1708-ce/
21st October Hindu: Dussehra / Durga Puja
A festival on the last day of Durga Puja, celebrating the victory of good over evil.
https://www.reonline.org.uk/festivals-calendar/dussehra-vijaya-dashami/
25th October Hindu: Lakshmi Puja
Lakshmi Puja is a significant religious observance in Hinduism, primarily dedicated to Lakshmi, the goddess of wealth, good fortune, beauty, and abundance.
https://bangiyaparishad.ca/lakshmi-puja-embracing-prosperity-tradition-and-togetherness/
26th October Buddhist: Pavarana Day
Pavarana Day is a deeply introspective and spiritual observance within the Theravāda Buddhist tradition, marking the end of the Vassa, a three-month period during the monsoon season.
https://www.spiritualarts.org.uk/pavarana-day/
31st October Christian: All Hallows’ eve
All Hallows’ Eve is the evening celebration commencing the feast of All Saints Day.
https://www.bbc.co.uk/religion/religions/christianity/holydays/halloween_1.shtml