(Extracted from pantheon.org)
Egyptian Feast days
January | February | March | April | May | June | July | August | September | October | November | December
January 2
Advent of Isis, the Egyptian goddess of love.
January 3
The festival of Pax the Roman goddess of peace.
January 5
The festival of Lares Compitales, the Roman guardian deities of crossroads.
January 6
Feast of Kore, the celebration of Kore's, the Egyptian of fertility
and grains, return to earth after six years of exile in the underworld.
January 7
Sekhmet, the Egyptian New Year's Day.
January 8
Festival of Justitia, the Roman goddess of justice.
January 9
The Agonium, festival of Janus, the Roman god of gates and doors, beginnings and endings.
January 11 and 15
The Carmentalia, festival of Carmenta, the Roman goddess of childbirth.
January 16
The Festival of Concordia, the Roman goddess of harmonious relations.
January 17
Good Luck Day, the festival of Felicitas, the Roman goddess of good luck.
January 21
Celtic New Year, the first day of the month of Luis (Rowan) in
the Celtic Tree Calendar.
February 1 and 2
Imbolc, the Celtic festival marking the period of lactation of
the ewes.
Also the festival of Brigit, the Celtic goddess of healing, fertility, and patroness of smiths.
February 12
The Festival of Artemis, the Greek goddess of the hunt (known as Diana to the Romans).
February 15
The Lupercalia, the festival of Lupercus, the Roman god of flocks and fertility.
February 17
The festival of Fornax, the Roman goddess of bread-making.
The Quirinalia, the festival of Quirinus, an earlier Roman god of war.
February 13-21
The Parentalis and the Feralia, the festival of the Manes, the Roman spirits of the dead, who inhabit the underworld.
February 22
The festival of the goddess Concordia, the patron of good will and favor.
February 23
The Terminalia, the festival of Terminus, the Roman god of boundaries and border markers.
March 1
The Matronalia, the primary feast of Juno, the chief Roman goddess.
On this day, lambs and other cattle were sacrificed to her.
The Feriae Marti, the festival of Mars, the Roman god of war.
This is also the New Year's Day in the old Roman calendar.
Saint David's Day.
March 2
Holy Wells Day, the day of Ceadda, the Celtic goddess of healing
springs and holy wells.
March 15
The Festival of Anna Perenna, the Roman goddess of the circle of the year.
Her festival was celebrated on the full moon of the first month
of the Roman year (the Ides of March).
March 16 - 17
The festival of Bacchus, the Roman god of wine (also known as Dionysus to the Greeks).
March 17
The Liberalia, the festival of Liber and Libera, a Roman fertility god and goddess.
Saint Patrick's Day.
March 19 - 23
The Mivervalia and Quinquatria, main festivals of Minerva, the Roman goddess of war, but also of wisdom arts and trades.
March 30
The Festival of Salus, the Roman goddess of public safety and welfare.
March 31
The Festival of Luna, the Roman goddess of the moon.
April 1
The Veneralia, the festival of Venus, the Roman goddess of love and beauty.
April 5
Lady Luck Day, the festival Fortuna, the goddess of good fortune.
April 7-8
Easter, derived from the festival of Eastre (Ostara), the Saxon goddess of spring.
April 8
Hana-Matsuri, the festival of Shaka), the Silent Sage from Japanese Buddhism.
April 9
The Lumeria, the festival in honor of the Lemures, the spirits of dead family members who wander the earth on these three spring nights.
April 15
The Fordicidia, the festival of Tellus, the Roman earth goddess.
April 16
The feast day of St. Bernadette.
April 19
The Cerealia, festival of Ceres, a Roman corn goddess.
April 21
The Palilia (Parilia), the festival of Pales, the Roman goddess of sheperds and flocks.
This is also the legendary founding date of Rome.
April 23
Saint George's Day.
April 25
The Robigalia, the festival of Robigus, a Roman corn god.
April 28 - May 1
The Floralia, the festival of Flora, Roman goddess of fruitfulness and flowers.
April 30
Beltine, on this Caileach Beara, a Celtic goddess, turns to stone.
She is reborn on October 31, Samhain.
May Day Eve, Walpurgis Night, formerly the date of the pagan festival marking the beginning of summer.
May 1
The day of Saint Walburga (8th century AD).
May 1
Beltane, the Celtic festival marking the beginning of summer,
where the cattle was driven between purifying fires before they
were let out to graze the meadows.
Also the festival of Belenus, the Celtic god of fire and the sun.
May 8
The festival of Mens, the Roman goddess of mind and consciousness.
May 15
The Mercuralia, the festival of Mercury, the Roman god of merchants and travellers.
June 1
The festival of Carna, the Roman goddess of bodily organs.
June 3
The festival of Bellona the Roman goddess of war.
June 9
The Vestalia, the festival of Vesta, the Roman goddess of the hearth.
June 11
The Matralia, the festival of Mater Matuta, old Italian goddess of the dawn.
June 21
Summer Solstice.
June 24
The festival of Fata, the Roman goddesses of fate and chance.
Saint John's Day.
July 7
Nonae Caprotinae ("the nones of the wild fig"), the second festival of Juno, the chief Roman goddess.
July 23
Neptunalia, the festival of Neptune, the Roman god of the sea.
August 1
The Lugnasad, the Celtic festival marking the harvest period.
Also the festival of Lug, the Celtic hero god.
August 9
The festival of Sol Indigis, the Roman sun god.
August 13
The Vertumnalia, the festival of Vertumnus, the Roman god of seasons, gardens and orchards.
August 17
The Portunalia, the festival of Portunes, the Roman god of gates, doors and harbours. At this festival, people would throw keys into the fire in order to bless them.
August 19
The Vinalia, the festival of Jupiter, the chief Roman god.
August 21
The festival of Consus, the Roman god of good council.
August 23
The Volcanalia, the festival of Vulcan, the Roman god of fire.
August 25
The Opiconsivia, the harvest festival of Ops, the Roman goddess of harvest.
September 19
The Fast of Thoth, this day-long fast honors the Egyptian god of wisdom and magic.
September 21
The feast of the Divine Life, this ancient Egyptian feast honored
the great goddess in her three-fold aspect as mother (creator),
daughter (renewer), and dark mother (the absolute).
September 26
The Festival of Chang O, on the full moon nearest the autumnal equinox, the Chinese people pay homage to the moon goddess Chang O. Some Chinese celebrate this day as the moon's birthday.
October 1
The festival of Fides, the Roman goddess of good faith, honesty and oaths.
October 3
The festival of Dionysus, the Greek god of wine and revelry, also known as Bacchus to the Romans.
October 9
The festival of Felicitas, the Roman goddess of good luck and joy.
October 11
The Meditrinalia, the festival of Meditrina, the Roman goddess of healing.
October 12
The festival of Fortuna Redux, the Roman goddess of successful journeys and safe returns from those journeys.
October 13
The festival of Fontus, the Roman god of springs.
October 19
The Armilustrium, the second festival of Mars, the Roman god of war.
On this day, military arms were ritually purified and put in storage
for winter.
October 31 - November 1
Samhain, the Celtic festival marking the beginning of the winter
and the Celtic New Year. Also the rebirth of Caileach Beara, the
Celtic goddess who turned to stone on May 1 (Beltane).
The tradition of Samhaim still exists as Halloween or All Souls'
Day.
November 1
Samhain (see October 31).
November 24
The feast of Baba Yaga. On the full moon of November, the supreme crone goddess of old Russia is honored with a feast day. Once honored as an important old goddess, she is now often portrayed as a wicked old witch.
December 1
The festival of Poseidon, the Greek god of the sea. Poseidon is also the god of rebirth.
December 4
The festival of Bona Dea, a Roman fertility goddess.
December 9
The Optalia, the festival of Ops, the Roman goddess of harvest.
December 13
The Sementivae, the second festival of Tellus, the Roman earth goddess.
December 15
The second festival of Consus, the Roman god of good council.
December 17
The Saturnalia, festival of Saturn, the Roman god of agriculture.
The most popular Roman festival, for on this day the roles of
master and slave were reverted.
December 21
Winter Solstice.
The festival of Angerona, the Roman goddess of secrecy.
December 23
The Larentalia (Larentinalia), festival of Acca Larentia the Roman goddess who gave the early Romans their land.
December 25
Christmas
The birthday of Mithra, the Persian god of light and wisdom.