The Intermountain Jewish News has a great essay by R Hillel Goldberg, titled “Shauvuot-Something Real, But Not Concrete” available here.
Shavuot celebrates the giving of the Torah. If one does not delve into the Torah, its meaning is meaningless. One may approach many Jewish holidays at the last minute. Not Shavuot. One must live with the Torah, breathe it, find joy in it, be troubled by its sometimes seemingly inaccessible teachings. One must occupy oneself with the Torah, struggle with it, let it color one’s mind and soul, in order to grasp it.