The Holy Spirit Comes to the Disciples

As Jesus had promised before ascending to heaven, the Holy Spirit came to the disciples to guide and strengthen them. Which Jewish feast day did the Holy Spirit come on?

There appeared to them divided tongues, as of fire, and one sat upon each of them. Which other sign accompanied this event?

The disciples began speaking in tongues and each person in the crowd heard them speak of the wonders of God in his own language. However, some people in the crowd were skeptical. What did these skeptics say?

What time of day did this event occur?