What is "penkkarit"

Penkkarit (more formally penkinpainajaiset, "benchpressing [fest]", or bänkskuddardagen ("penkkis") in Swedish) is a yearly tradition among Finnish upper secondary school students. The event is celebrated in the spring of their final, usually third, year as the final day of school, before the start of the matriculation exams. Traditionally, the date of penkkarit is a Thursday in late or mid-February.