1st Buddhist Entry to the Vassa
Vassa is a significant term in Theravada Buddhism, referring to the three-month rainy season during which bhikkhus observe strict monastic rules and often remain in one location. This period is dedicated to spiritual practice, deeper meditation, and study of teachings, including the Abhidhamma.
https://www.spiritualarts.org.uk/the-entry-to-the-vassa/
1st Zoroastrian Jashn-e-Tirgan
Jashn-e Tirgan is an ancient quarter year summer festival, celebrated about three months after the spring NoRuz. Tirgan is devoted to the divinity Tir and is associated with the dog-star Sirius and the coming of the rains in Iran and the fertility they bring.
On this day it is customary to visit the Fire Temple to give thanks to Ahura Mazda, to participate in a jashan or thanksgiving ceremony, listen to stories of how the boundaries of Iran were established in antiquity with its Central Asian neighbour Turan (now Turkmenistan) by an archer shooting an arrow, share a community meal, play with ‘rainbow’ bracelets made of seven coloured silks, splash each other with water, and dance and make merry.
https://www.spiritualarts.org.uk/jashn-e-tirgan/
6th – 15th Zoroastrian (Kadmi) Fravardigan
The Fravardigan festival (the festival of the fravashis), popularly known as Muktad (All Souls), commences ten days before NoRuz and is the last festival of the old year. The Zoroastrian day commences at sunrise and not midnight, and so during sunrise on the first day of the festival the immortal souls, together with their fravashis (the guardian spirits of departed ancestors, artistically depicted as half man/half bird), are welcomed by name by the Zoroastrian Mobeds or Magi (priests). https://africanjournalofbiomedicalresearch.com/
https://www.spiritualarts.org.uk/fravardigan-muktad/
9th/10th Baha’I Martyrdom of the Bab
This major holy day is celebrated on the 10th July at noon and commemorates the events surrounding the death of the Báb in 1850.
https://www.upliftingwords.org/post/story-of-the-martyrdom-of-the-bab
21st Zoroastrian (Kadmi) Khordad Sal
Khordad Sal is celebrated as the birthday of Zoroaster. This is known as the ‘Greater Noruz’ and happens six days after Noruz.
https://www.spiritualarts.org.uk/khordad-sal/
22nd/ 23rd Jewish Tisha B’av
Tisha B’Av, the solemn Jewish day of mourning, holds deep significance for Jewish communities worldwide. Observed on the 9th day of the Hebrew month of Av, this poignant occasion marks the commemoration of historical tragedies that have profoundly impacted the Jewish people.
https://www.myjewishlearning.com/article/tisha-bav-101/
29th Buddhist Asalha Puja /Dhamma Day
Asalha Puja, also known as Dhamma Day, is one of the most sacred observances in the Theravāda Buddhist tradition. Celebrated on the full moon of the lunar month of Āsāḷha (typically July), it marks the moment when the Buddha first turned the Wheel of Dhamma—his inaugural discourse following his enlightenment. This is the day the Dhamma was shared, the Sangha began, and the path toward liberation was formally opened to the world.
https://www.reonline.org.uk/festivals-calendar/asalha-puja-dhamma-day/
With thanks to The Shap Calendar for the valuable information