Rapture Party Day – This is holiday came about by someone falsify predicting the rapture date.
As we know, NO ONE knows when that day is. Not even the angels know. Only God the Father knows. See Matthew 24:36, 1 Thessalonians 5:1-3, 2 Peter 3:10, Revelation 3:3.

Back in 2011, there were people that believed it would happen and they threw a party for it. They believe it would occur on May 21, 2011.
Rapture, in Christian theology is that all Christians will be taken up into the sky, leaving our earthly bodies and being united with Jesus Christ. Those who are not Christian, will be left behind.
Harold Camping, former president of Family Radio, a Christian broadcasting network, made a prediction in 2001 that the rapture—the start of the end of the world and the taking up of Christian believers into heaven—would occur on May 21, 2011.
CheckiDay
Camping also predicted the time, he believe it would have been at 6 p.m. on that day. It never came. This shows that know one knows when Jesus will return. He also falsely predicted Judgement Day would be 5 months later on October 21.
He also made false predictions in 1994. That should tell you he wasn’t someone to trust!
Because of his false predictions, many of the people prepared for it by witnessing and selling their goods. Most of them even quit their jobs.
Later on Camping, said he was wrong again and said the Rapture would happen October 21. On October 16, he admitted he didn’t really know.
It doesn’t matter if you are Pre-Tribulation, Post-Tribulation or Amillennial in your believe in the end of times, know one knows!
But, we should be ready for the coming of Christ at any moment. We are never promised tomorrow.
Now you know the story about the Rapture Party.