Hamaspathmaidyem

Zoroastrians observe Hamaspathmaidyem – the Festival of All Souls – on days 361 to 365 days (March 16 to 20). It marks the spring equinox and humans’ evolution on the earth.

Zoroastrians observe six seasonal festivals that celebrate the sanctity of God’s universal creations. Each Gahambar lasts five days and honors the five material creations: earth, water, plants, animals and humans. Believers spend the first four days reciting scriptures and come together on the last day for a feast.

Sourced from https://theguibordcenter.org/zoroastrian-holy-days-and-observances/