My Sabbath correspondences - feasts

Imbolc - Candlemas
the Presentation of Jesus at the Temple, the Feast of the Purification of the Virgin, and the Meeting of the Lord
Groundhog Day
The Oriental New Year usually falls around this date
LupercaliaLent festivities are also often in February, Shrovetide, Mardi Gras, Carnivale
Valentine's day, Vali's BlotNew Year of the Trees (Tu BiShvat)

Ostara - Easter - Spring Equinox - Pesach
Persian and Indian New Year, Nowruz
Lady's Day, Arab Mothers' Day, Purim, Annunciation, Dísablót
Lieldienas
Yggdrasil Day, Earth Day

Beltane - May Day
May Day, Calan Mai, Walpurgis Night
Whitsun, Pentecost, Green Week (falls usually in May)
Ludi Florales

Litha - Midsummer - Summer Solstice
Adonia
St. John's Feast Day, Jāņi, Ivan Kupala Day, Juhannus, Sankthans, Jaanipäev
Liða, Lissa
Mittumaari,
Alban Hefin,
Gŵyl Ganol yr Haf
Rasos
Tiregān

Lammas - loafmas - lughnasadh
The Savior of the Apple Feast Day; The Honey Savior and the Nut Savior - Eastern Slavic folk holidays, Spas - 14th, 19th and 29th of August
Festival of "St Peter in Chains"
Feast of the Transfiguration
The Feast of the Dormition
Dog Days

Mabon - Michaelmas - Autumn Equinox
Michaelmas, the Feast of Saints Michael, Gabriel, Uriel and Raphael, the Feast of the Archangels, or the Feast of Saint Michael and All Angels
Festival of strong will
Lord's Day
Jashne Mihragan
Chuseok
Mid-Autumn Festival, Moon Festival, Moocake Festival, Lantern Festival
Pomona
Harvest Moon, Harvest Festival
October Fest
The Jewish Holy Days often fall around this date

Samhain - Hallowmas - Halloween
All Saints' Day, All Hallows, Solemnity of All Saints, or Feast of All Saints (Toussaint)
Allhallowtide
All Souls' Day
Day of the Dead
Guy Fawkes Night, also known as Guy Fawkes Day, Bonfire Night and Firework Night
Diwali is also celebrated at this time of the year
Allantide
Thanksgiving

Yule - Midwinter - Christmas - Winter Solstice