Paryushan is the most important annual festival in Jainism, a period of spiritual reflection, fasting, prayer, and study observed over eight days by Svetambara Jains. It is a time for practicing the core Jain values of nonviolence, self-discipline, and the purification of the soul, often culminating in heartfelt repentance and the seeking of forgiveness from all beings. The festival concludes with Samvatsari (or Kshamavani), on which Jains ask pardon for any harm caused, expressed in the phrase "Micchami Dukkadam," meaning may any wrongdoing be forgiven.

Gahambar Paitishem (also spelled Paitishahem) is one of the six seasonal festivals, known as Gahambars, observed in Zoroastrianism, each celebrating a stage of the agricultural year and an aspect of creation. Paitishem marks the bringing in of the harvest, typically falling in mid-September, and is traditionally a time of communal gathering, shared feasting, prayer, and charity, reflecting the Zoroastrian values of generosity and fellowship. Like the other Gahambars, it expresses gratitude to Ahura Mazda for the bounty of creation and emphasizes community, with the food and offerings shared freely among all who attend, regardless of means.

Ganesh Chaturthi celebrates the birth of Lord Ganesha, the elephant-headed Hindu deity revered as the remover of obstacles and the patron of beginnings, wisdom, and good fortune. Observed over ten days in the month of Bhadrapada (usually August or September), it is marked by the installation of Ganesha idols in homes and public pavilions, daily prayers and offerings of sweets such as modak, and devotional singing. The festival concludes with Visarjan, the joyful procession in which the idols are immersed in water, symbolizing Ganesha's return home and the cycle of creation and dissolution.

Das Lakshan is the ten-day festival observed by Digambara Jains as their principal annual occasion for spiritual reflection and purification, typically falling in the month of Bhadrapada (around August or September). Each of the ten days is dedicated to contemplating one of the ten supreme virtues, or dharmas, such as forgiveness, humility, truthfulness, and self-restraint, which guide the soul toward liberation. The observance is marked by fasting, scriptural study, worship, and seeking and granting forgiveness expressed through the phrase "Uttam Kshama," may any wrongdoing be forgiven.

Yom Kippur, the Day of Atonement, is the holiest day in the Jewish calendar, observed on the tenth day of Tishrei (usually September or October) as the culmination of the High Holy Days that begin with Rosh Hashanah. It is marked by a full day of fasting, intensive prayer, and repentance, during which the faithful seek forgiveness for wrongdoing and reconciliation with God and with one another. Tradition holds that on this day one's fate for the coming year is sealed, making it a solemn time of reflection, atonement, and spiritual renewal, often concluded with the sounding of the shofar.

Mabon is a modern Pagan and Wiccan festival celebrating the autumn equinox (usually around September 21st–23rd), one of the eight sabbats on the Wheel of the Year, marking the point when day and night stand in balance. It is observed as a harvest thanksgiving, a time to express gratitude for the fruits of the season and to reflect on themes of balance, reciprocity, and preparation for the coming darker half of the year. The name Mabon, drawn from a figure in Welsh mythology, was popularized in the 1970s, and the festival is often marked with seasonal foods, gatherings, and rituals honoring the second harvest.

Sukkot, the Feast of Tabernacles, is a Jewish festival beginning on the 15th day of Tishrei (usually September or October), shortly after Yom Kippur, and lasting seven days. It commemorates the forty years the Israelites spent dwelling in temporary shelters during their journey through the wilderness, and is observed by building and eating (and sometimes sleeping) in a sukkah, a temporary hut roofed with natural materials. It is also a harvest festival of joy and gratitude, marked by the gathering and waving of the four species (lulav and etrog), hospitality, and celebration, expressing thanksgiving for the autumn harvest and trust in divine providence.

Shemini Atzeret is a Jewish holiday that follows Sukkot, offering a time for rest, gratitude, and deeper spiritual connection at the close of the festival season. Many Jewish communities observe the day with special prayers, including prayers for rain, and in some traditions outside Israel, it is celebrated together with Simchat Torah, a joyful celebration of the annual Torah reading cycle.

Simchat Torah is a Jewish holiday that marks the completion of the annual cycle of reading the Torah and immediately begins the new cycle. It is celebrated in the fall (usually October) with singing, dancing, and parading with the Torah scrolls in the synagogue.

Navaratri (derived from Sanskrit, meaning "nine nights") is a major Hindu festival dedicated to the worship of the Goddess Durga. Spanning nine days and ten nights, it celebrates the triumph of good over evil and culminates on the tenth day with Vijayadashami (or Dussehra). Celebrations include honoring the nine forms of the Goddess over the course of nine days through worship, decorative displays, recitations of sacred legends, dramatic reenactments, and the chanting of Hindu scriptures.

Gahambar Ayathrem is one of six sacred seasonal festivals (Gahambars) in Zoroastrianism. Celebrated for five days, it symbolizes the creation of plants and marks the ancient agricultural tradition of bringing herds back from pasture and preparing for winter.

Durga Puja is a major multi-day Hindu festival celebrated each autumn. It commemorates the victory of Goddess Durga over the demon Mahishasura, symbolizing the triumph of good over evil. The festival is marked by elaborate temporary shrines (pandals), intricately crafted clay images of the goddess, cultural performances, devotional worship, and festive community gatherings.

Samhain is a sacred festival observed by many Pagans, Wiccans, and Celtic spiritual traditions, typically from the evening of October 31 into November 1. It marks the end of the harvest season and the beginning of the darker half of the year, while also serving as a time to honor ancestors and remember those who have died. Many observe Samhain by lighting candles or bonfires, preparing seasonal meals, visiting gravesites, creating ancestor altars, and participating in rituals focused on remembrance, reflection, and renewal.

Birth of the Báb commemorates the 1819 birth of Siyyid `Alí-Muhammad, known as the Báb, who declared himself a divine messenger in 1844 and is regarded by Bahá'ís as a forerunner to Bahá'u'lláh, similar to the role of a prophet heralding a new revelation. The Báb's own teachings and the religion he founded, Bábism, are seen by Bahá'ís as a preparation for the coming of Bahá'u'lláh. This holy day is one of several "Twin Birthdays" in the Bahá'í Faith and is typically marked with prayer gatherings, devotional readings, and celebration, often falling on consecutive days with the Birth of Bahá'u'lláh.

Birth of Bahá'u'lláh commemorates the 1817 birth of Mírzá Husayn-`Alí Núrí, known as Bahá'u'lláh ("Glory of God"), the founder and central prophetic figure of the Bahá'í Faith, who Bahá'ís believe was the most recent in a line of divine messengers that includes Moses, Buddha, Jesus, and Muhammad. Bahá'ís regard him as having brought teachings emphasizing the unity of humanity, religion, and science for this age. Observed alongside the Birth of the Báb as one of the Twin Birthdays, this holy day involves gatherings for prayer, reflection on Bahá'u'lláh's writings, and communal celebration, and work is typically suspended for Bahá'ís observing the holiday.

The Nativity Fast is a 40-day period of spiritual preparation observed by Orthodox Christians leading up to the celebration of Christ's birth, typically beginning on November 15th and continuing through December 24th on the traditional calendar (dates vary for churches using different calendars). During this time, practitioners abstain from from meat, dairy, and other rich foods and practice increased prayer, almsgiving, and attendance at church services, as a way of cultivating humility and readiness to receive Christ. The fast is approached with quiet joy and anticipation, culminating in the Feast of the Nativity, where the fast is broken in celebration of the Incarnation of Christ.

Day of the Covenant is a Bahá'í holy day that commemorates Bahá'u'lláh's appointment of his eldest son, `Abdu'l-Bahá, as the authorized interpreter of his teachings and the Center of the Covenant after his passing. Bahá'ís view this covenant as central to preserving the unity of their faith, ensuring a clear and unbroken line of guidance rather than the fragmentation seen after the passing of leaders in some other religious traditions. The day is generally observed with joyful gatherings, prayers, and reflections on the importance of unity.

Ascension of Abdu'l-Bahá is a Bahá'í holy day marking the 1921 passing of Abdu'l-Bahá, the eldest son of Bahá'u'lláh who served as the appointed successor and authorized interpreter of his father's teachings. Bahá'ís regard him as a model of humble service and selfless devotion, and he is remembered for expanding the Bahá'í Faith internationally and for his extensive writings and talks explaining Bahá'í principles to audiences worldwide, including during travels through Europe and North America. This day is typically observed with prayer gatherings and reflection rather than celebration.

Advent is a season in the Christian calendar that begins four Sundays before Christmas and marks a time of anticipation and preparation for the birth of Jesus Christ. It is observed with themes of hope, peace, joy, and love, often symbolized by the lighting of candles on an Advent wreath each week. Many Christians use this time for reflection, prayer, and acts of kindness as they await the celebration of Christmas.