The nation was called Israel. The mountain was called Sinai. At Sinai, G-d gave the Jewish People the Torah, the mystical blueprint of the Creation. We tend to think of the Jewish festivals as remembrances to remind us of critical events in Jewish history, and that these events recede further into the past every year. This is not so.
Time is circular.
Every year we revisit the same place in time, the same reality. Every Pesach or Shavuot or Succot we revisit the original event. We do not merely remember what took place on these days, we re-experience them. The word for festival in Hebrew is mo'ed. Every year, we return to that same meeting place in time, be it Pesach, Shavuot or Succot.