 
   public init() {}
 
-  public func makeEditable() -> EventDescriptor {
+  public func makeEditable() -> Event {
     let cloned = Event()
     cloned.startDate = startDate
     cloned.endDate = endDate

import UIKit

open class Event: EventDescriptor {
  public var startDate = Date()
  public var endDate = Date()
  public var isAllDay = false

  }

  public func commitEditing() {
    guard let edited = editedEvent else {return}
    edited.startDate = startDate
    edited.endDate = endDate
