What is the fine-grained topic of the following text: In 1699, led by Pierre Le Moyne d’Iberville, they made camp approximately 60 miles from present-day New Orleans and dubbed the site “Point du Mardi Gras” since that day, March 3, marked the celebration of Mardi Gras in Paris. Only return the topic.
Establishment of "Point du Mardi Gras" by Pierre Le Moyne d’Iberville in 1699.