What event should take place for the minister but did not in the ministers black veil?

In Nathaniel Hawthorne's short story "The Minister's Black Veil," a significant event that should have occurred is the minister's planned sermon. Instead of delivering a typical message of hope and redemption, Reverend Hooper's decision to wear the black veil leads to a disrupted and unsettling atmosphere during the service. His mysterious appearance causes the congregation to react with fear and confusion, ultimately isolating him from the community he serves. This pivotal moment underscores the themes of sin, secrecy, and the human condition.