Marc123
You got it dude!
The First event is the rapture.
That's When King Jesus comes like lightning from east to west riding on a cloud to save those who believe in Him from the day of the LORD that will come like a thief in the night upon everybody else that's been left behind.
What follows that will be the worst time in all of human history.
Multiply every apocalyptic/alien /horror/end of the world movie that Hellywood has programmed the world with by "pi" and then you will get close to the reality of the Great Tribulation aka Jacobs trouble.
Amen
Have a good weekend bro