Hey @Madan71582. While you won’t be able to track this from the event resource, you may have success tracking this from the invitee resource.
Check out our list event invitees endpoint which can be called for an event.
The invitee resource contains optional new_invitee and old_invitee fields which can be used to connect up a rescheduled event. When an invitee reschedules, the existing invitee will be canceled (and have rescheduled as true) and the new invitee’s URI will be in new_invitee. For the new event, the invitee will have an old_invitee, which will be the original invitee’s URI.
I hope this will allow you to sort this data in your system.