What is the ruling on a woman going out without a mahram to attend ceremonies honoring outstanding students of Islamic knowledge, and ceremonies that encourage wearing the legal hijab and niqab?

A woman is permitted to go out for her needs without traveling, provided she is safe, veiled, and does not fear temptation. The presence of a mahram is a condition for travel, not for leaving the house, keeping in mind that the fundamental principle is for a woman to remain in her home.