The Jewish Feast of Trumpets is also known as the Day of Judgment. It starts off with examining your life and then spending the next 10 days trying to do enough good stuff to outweigh the bad. The Jews miss how Jesus fits into this though, and they miss that you can't do enough good to outweigh the bad. Jesus is the only solution, and when the trumpets blast at the end, judgement will come.
Numbers 29:1 & 1 Thessalonians 4:16
Judgement is coming and now is the time to prepare for it.