Okay kiddo, let me explain what new calendarists are. You know how we have a calendar that tells us what day, month, and year it is? It helps us keep track of time and plan our days, right? Well, the new calendarists are a group of people who wanted to change the way we celebrate religious holidays.
You see, there are different religions that celebrate these holidays on different days. For example, Christians celebrate Christmas on December 25th, but some other religions celebrate it on a different day. The new calendarists thought that it would be better if everyone celebrated these holidays on the same days, so they came up with a new calendar.
This new calendar moved certain holidays to different dates so that they would all be celebrated at the same time. Some people liked this idea, but others did not. This caused a lot of disagreements and arguments between different religious groups.
So, to sum it up, the new calendarists are people who wanted to change the way we celebrate religious holidays by creating a new calendar that would make everyone celebrate them on the same days.