Sankashti Chaturthi, also known as Sankatahara Chaturthi and Sankashti, is a holy day in every lunar month of the Hindu calendar dedicated to the Hindu god Ganesha. This day falls on the fourth day of the Krishna Paksha. From Wikipedia
The observance highlights Lord Ganesha’s dark-hued Krishnapingala aspect as a symbol of introspection, renewal; lunar-aligned rituals aim to foster spiritual transformation.