Easy Calendar - collisions notification

Add the notification for meeting author when he creates a meeting that some of users he invited to a meeting have another activity in that time. Specifically, display this notification if invited users have:

● Non working activity in attendance
● Another approved meetings

In the end, notification should be displayed 3 possible variants of meeting time suitable for all invited users, and if Author will click on it, this time will automatically be added to a new meeting form. The evaluation would be performed every time when the meeting start/end date/time is being edited.