When walking about on our way to Saint Sulpice Cathedral, we chanced upon a street festival in the plaza right in front of it in the church. What appeared to be permanent booths were there, implying that events were regularly held there for different organizations.

What appeared to be going on the day we were there, was the 10th Annual Games and Mathematics Festival. Lots of children there, exploring booths with puzzles and games, and mathematical items of interest.

A translation of the festival website is here.