I’m not sure if that’s what you mean but in the Calendar component in the Pro version, it is possible to select multiple events and then delete them using the API (use multiselect.events() to get a list of events and events.remove() to delete them).
In the Calendar, there is no frozen row at the top other than the all-day events row. To move an event to the all-day events row, set its allday property to true and update the event using events.update().
In the Scheduler component, it is possible to freeze one or more rows (representing resources) at the top or bottom of the Scheduler grid.