The Feast of Trumpets is a feast where God is setting the culture for the Israelites so that they will revere God, repent, and rejoice. The trumpet blast is also a signal that God is meeting with the Israelites. It is a time of remembrance of when they first met God on the Mount of Sinai. We take time to pay attention, because God is holy, we repent of sin, and we rejoice that God introduced Himself to us.