What was the first for the plymouth colony?

I think it's As was the custom in England, the Pilgrims celebrated their harvest with a festival. The 50 remaining colonists and roughly 90 Wampanoag tribesmen attended the "First Thanksgiving." The major similarity between the first Jamestown settlers and the first Plymouth settlers was great human suffering.

I learned this in 4 th grade and my teacher thought it to me and I understand it so if its wrong don't blame blame my teacher cuz she asked us the same question and I didn't understand it then she told us the answer and know I get it