June 4: Buddha Day (Visakha Puja), and Anniversary of Temple
Visakha Puja celebrates the Buddha’s birthday, enlightenment day, and passing away day. They all occurred in his life on the full-moon day in May, in different years of course. Therefore, this is one of the most important days in the Buddhist tradition, if not the most important. Visakha refers to the Visakha asterism, a Vedic construct, having to do with the day when the moon and the Visakha constellation align.
Ajahn Lee spoke about the way Thais honor this day: https://www.accesstoinsight.org/lib/thai/lee/visakha.html
July 30 Asalha Puja and Buddhist Lent Ceremony
During the Buddha’s time, monks were required to stay at their home temple, and not travel overnight during this retreat time known as vassa. Today, Theravadan monks follow this tradition.
Buddhangkura Buddhist Temple 