This study evaluates how a Mathematics Festival influences students’ attitudes toward the discipline in a secondary school in southern Chile. Using an adapted version of the Attitudes Toward Mathematics Inventory (ATMI), the research reveals a positive impact on students’ appreciation of mathematics. A novel finding was a motivational difference by gender, with an increase among male students and a decrease among female students. The results highlight the relevance of such festivals in strengthening positive perceptions of mathematics and the need for inclusive approaches..