big athletic meet; sports day; field day
Refers to a large-scale sports day event, typically held at schools, often involving the whole school or multiple grades. The prefix 大 emphasizes the scale or importance.
See also: 運動会
This year's big athletic meet will involve all the students in the school.
小学校の大運動会で、赤組と白組に分かれて競技をしました。
At the elementary school's sports day, we split into red and white teams and competed.
運動会 is a standard sports day or athletic meet, while 大運動会 implies a larger, more significant event, often with more participants or a grander scale.
Compound of 大 (big, great) and 運動会 (athletic meet, sports day). The prefix 大 adds emphasis on the scale or importance of the event.