The answer is: Purim

Esther 9:26

Purim is such a vibrant and joyous festival in Jewish tradition, commemorating the remarkable story of Esther and how she bravely helped save her people from annihilation. The Book of Esther vividly depicts a tale full of plot twists, improbabilities, and Divine timing. Interestingly, Purim usually falls in February or March, coinciding with the Jewish month of Adar, specifically on the 14th day.

One highlight of this lively celebration includes people dressing in costumes, drawing from the whimsical notion that identities in the story shift dramatically, much like during a masquerade. This reflects the timeless truth that sometimes, appearances can be deceiving. On a deeper level, people will often read the Megillah (which is the scroll of Esther) aloud on the evening before Purim in their communities, actively engaging with the text.

Another quirky fact is that beyond the joyous celebrations, that part of the story highlights themes of social justice and activism, encouraging the community to be aware of their collective power in confrontations with oppression. It's about the shift of fortune; where enemies became friends and the tide turned in favor of the Jewish people—hence the reason for the raucous merriment today.

Moreover, as part of the Purim traditions, people exchange food gifts and donate to the less fortunate, further emphasizing communal responsibility. This festival serves as a delightful reminder that bravery, unity, and compassion can triumph over adversity.