1st May Pagan Beltane
A festival marking the beginning of Summer, associated with fertility for families, fields, livestock and also of imagination and inspiration. Beltane essentially means ‘Fires of Bel’ and is one of the fire festivals.
https://religionmediacentre.org.uk/factsheets/the-festival-of-beltane/
1st/ 2nd May Baha’i 12th day of Ridvan
The Twelfth Day of Ridván is one of the most important festivals in the Bahá’í Faith. This day commemorates the exile of Baha’u’llah, his family, and several followers to Constantinople. Although this exile would lead to imprisonment, torture, sickness, hardship, and death, it would also lead to the growth and spread of Baha’u’llah’s teachings. Baha’is celebrate this day as the start of their faith and as a symbol of renewal, peace, and Baha’u’llah’s vision of unity and progress for all people.
https://nationaltoday.com/12th-day-of-ridvan/
5th May Jewish Lag B’Omer
Lag Ba’omer is a holiday that occurs on the 33rd day of the Omer, the 49-day period between Passover and Shavuot.
https://www.chabad.org/library/article_cdo/aid/679300/jewish/What-Is-Lag-BaOmer.htm
14th May (21st in the Orthodox traditon) Christian Ascension day
Ascension Day is a Christian holiday that celebrates the ascension of Jesus into heaven.
https://www.reonline.org.uk/festival_event/ascension-day-40th-day-after-easter-2
22nd May Zoroastrian Zaratosht-no-Diso
Zartosht no-Diso, is a commemoration of the death anniversary of the prophet Zoroaster. It is observed on the 11th day (Khorshed) of the 10th month (Dae) of the Fasli Calendar.
https://www.reonline.org.uk/festival_event/zaratosht-no-diso-2
22nd/23rd May Jewish Shavuot
Shavuot is a Jewish holiday that happens every year. It’s a harvest festival celebrating the barley and wheat harvests. It also celebrates Moses receiving the Ten Commandments and the Torah from God.
https://www.chabad.org/library/article_cdo/aid/609663/jewish/What-Is-Shavuot.htm
24th May Baha’I Declaration of the Bab
The Báb was the forerunner of Bahá’u’lláh. His mission was to prepare the world for the coming of Bahá’u’lláh and he declared it in the evening of May 22 1844.
https://bahaiteachings.org/how-bahai-faith-began-declaration-bab/
24th May Buddhism Buddha’s birthday
Buddha’s Birthday is celebrated on the eighth day of the fourth lunar month, which typically falls in May.
https://www.reonline.org.uk/festival_event/buddhas-birthday
24th May Christian Whit Sunday
Penecost Whit Sunday is a Christian holiday commemorating the descent of the Holy Ghost upon the disciples of Jesus Christ, according to the New Testament of the Bible.
https://www.reonline.org.uk/festival_event/pentecost-whit-sunday/
25th-29th May Muslim Hajj
Hajj is an annual pilgrimage to the Ka’aba in Mecca and is required of every Muslim at least once in their lifetime. The Hajj is one of the five pillars of Islam.
https://www.bbc.co.uk/newsround/24566691
27th May Muslim Eid ul Adha
Eid ul-Adha is the latter of the two Islamic holidays celebrated worldwide each year. It honours the willingness of Ibrahim to sacrifice his son Ismail as an act of obedience to God’s command. Before Ibrahim could sacrifice his son, however, Allah provided a lamb to sacrifice instead.
https://www.bbc.co.uk/newsround/av/57860808
29th May Baha’I The Ascension of Baha’u’llah
Baha’u’llah, the Prophet-Founder of the Baha’i Faith, passed away on 29 May, 1892. This holy day is commemorated by Baha’is all over the world and is known as ‘The Ascension of Baha’u’llah’.
https://www.bbc.co.uk/religion/religions/bahai/holydays/ascension.shtml