Facilitated by mathematicians and educators, a Math Circle is an informal method for students to engage in meaningful math. Young students, guided by a Math Circle leader, explore their mathematical thinking and understanding. Historically, Math Circles originated in Eastern European countries. You can find out more here: https://mathcircles.org/
According to Mathematical Sciences Research Institute, the organization that oversees the National Association of Math Circles, there are more than 200 Math Circles in the United States! In general, there are two types of Math Circles. One type is for K-12 mathematics teachers; the other, for students learning mathematics.
Humans have a knack for recognizing patterns, not just artistic patterns, but trends and progressions, too. Math is the language of patterns. If you can read, and you can breath, then you can do math. "To math" is human. Through discussion, exploration, hard work, and problem-solving, Math Circles provide an opportunity for all students to grow their mathematical thinking and their mathematical voice. Ideally, the problem discussions lead to a deep understanding of math concepts.