→ But first: Did you know that Indonesians also celebrate the Chinese New Year and Gregorian New Year? 1. In this article, you’ll learn all about this holiday in Indonesia and pick up some useful vocabulary at the same time. Muslims celebrate their New Year according to the Islamic calendar, which began around the same time that the Islam religion did. In Indonesia, and other predominantly Islamic countries, Muslims celebrate the Islamic New Year instead of the more popular Gregorian New Year that you’re probably used to.