There are numerous traditional festive events in Macao. A-Ma Festival, which is also called Mazu Festival, is on the twenty-third day of the third lunar month, and is a traditional event to celebrate A-Ma’s birthday.

A-Ma Festival on the day of 23rd of March is dedicated to the goddess, A-Ma, said to be a legendary heroine who saved Macau people from storms.

Source: https://www.travelchinaguide.com/cityguides/macau/when-to-go.htm