Hide time for the specific event

Add this code to the Custom CSS field on the Appearance tab of your Event Calendar widget’s settings:

[data-date="2022-11-02"] .fc-daygrid-day-events
.fc-daygrid-event-harness:nth-child(2) .fc-event-time {
display: none;
}

To choose the event where you’d like to hide the time, please set its index number after nth-child.