What is the ruling on co-educational universities, and is it permissible for a woman to participate in mixed-gender exhibitions organized by the university, if her enrollment in such universities has become one of the necessities of the era?

Studying in mixed-gender universities is dangerous and impermissible except out of necessity or dire need, with conditions including modesty, lowering the gaze, guarding one's private parts, minimizing evil, and choosing righteous companions. A woman's entry into these universities is not a religious necessity for every woman; rather, the ruling varies depending on her situation. If studying is permissible, then participating in mixed-gender exhibitions is not permissible due to lack of need or necessity, and a woman can spread knowledge among her own gender.