This evening and tomorrow (and Tuesday outside of Israel) the feast of Shavout (Weeks) is celebrated. Shavuot marks the beginning of the fruit harvesting season and the date the Israelites received the Ten Commandments. It is customary to study Torah at night, some even staying up all night.
The Three Festivals mentioned in the Bible (Sukkot, Passover and Shavuot) all have both agricultural and historical aspects. Although agriculture plays a minor role in the lives of most twenty-first century Jews, the agricultural aspect serves to remind the Jewish people of their connection to the Land of Israel.