I am trying to find info on a sort of celebration in France around the gaulic leader Vercengetorix. I am not even sure what it is called. I know there is one because I initially heard of it through a websearch. Just looking for some proof.
The correct spelling seems to be Vercingetorix
This story from NPR, How Gaul-ing! Celebrating France's First Resistance Fighter states:
The village of Alise-Sainte-Reine sits on a hilltop believed to be the former Gallic stronghold of Alesia, and each summer, it holds a festival celebrating Vercingetorix. Just as there is in the comic book Asterix and Obelix, there is music, drink and wild boar roasting on a spit.
This would seem to be the celebration that you are looking for.
Here is the official site of the museum MuséoParc Alésia in Alise-Sainte-Reine
This sub page lists the festivals Les Estivales - du 8 juillet au 1er septembre in 2023
And La Guerre des Gaules may be what you are looking for.