//public void Edit(Event oldEvent, Event newEvent)
        //{
        //    var index = Events.First(e => e == oldEvent).Id;
        //    Events.RemoveAt(index);
        //    Events.Insert(index, newEvent);
        //    PersistencyService.SaveEventsAsJson(Events);
        //}
        public async void LoadEventsAsync()
        {
            var eventslist = await PersistencyService.LoadEventsFromJson();

            if (eventslist != null)
            {
                Events.Clear();
                foreach (var e in eventslist)
                {
                    Events.Add(e);
                }
            }
        }