Heaven's apparent call is for people to repent and be saved. The grace of God that brings salvation has appeared to all men. Titus 2:11. The bible tells us in Isaiah 55:6 to call upon the lord while he's still near. It literally means there's a time the grace of God shall be lifted and it will be time for judgement. Heaven's last call shall be for the end of this age.
There shall be a sound from heaven and Michael, the arch angel shall sound the trumpet. The dead in Christ shall rise first, and those that are alive shall together see him in clouds and we shall forever be with the lord. Will you be there? Get saved and live a repentant life.