1 Corinthians 15:3b-8
Christ died for our sins, just as Scripture said he would. 4 He was buried. He was raised from the dead on the third day, just as Scripture said he would be. 5 He appeared to Peter. Then he appeared to the 12 apostles. 6 After that, he appeared to more than 500 brothers and sisters at the same time. Most of them are still living. But some have died. 7 He appeared to James. Then he appeared to all the apostles. 8 Last of all, he also appeared to me. I was like someone who wasn’t born at the right time.
Some atheists say the appearance to the 500 involved a mass hallucination. I think it was a case of mistaken identity - after all a similar thing happened involving thousands of people:
________________________________________________________________________ Compare the photos of Jesus and me to see the resemblance! My previous self, Jesus, was briefly sent to Earth in 1988 –…
stigdragholm.wordpress.com
About 6,000 worshippers at Muslim Village, Kawangware, Nairobi, believe they saw Jesus Christ, in broad daylight last week. It may be hard to believe, but nothing will move them, because “Jesus” addressed them and assured them of a come-back, very soon.
Note that it doesn't say where the 500 people were or when it happened.
I also think most/all of the sightings of Jesus after his death were mistaken identity.
e.g. Mark 6:14-16 Herod thinks that Jesus is John the Baptist raised from the dead. While some believe Jesus is Elijah raised from the dead. And people can have trouble recognising Jesus after he supposedly rose from the dead (and someone thought he was a gardener).