i'm not sure, rely, this is beyond what I can offer support for.
however, looking at the source of events.php, it looks like the first 2 event gets ID 1, then each one after it gets ID 2:
[{"id":"1","title":"92575","start":"2014-08-01","end":"2014-08-01","allDay":"","editable":"1","repeat_i":"1","repeat_f":"3","repeat_e":"2023-04-13"},{"id":"1","title":"77727","start":"2014-08-22","end":"2014-08-22","allDay":"","editable":"1","repeat_i":"1","repeat_f":"3","repeat_e":"2023-04-13"},{"id":"2","title":"51794","start":"2014-08-04","end":"2014-08-04","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"82558","start":"2014-08-06","end":"2014-08-06","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"86149","start":"2014-08-08","end":"2014-08-08","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"28106","start":"2014-08-10","end":"2014-08-10","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"49485","start":"2014-08-12","end":"2014-08-12","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"65132","start":"2014-08-14","end":"2014-08-14","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"11004","start":"2014-08-16","end":"2014-08-16","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"37249","start":"2014-08-18","end":"2014-08-18","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"67753","start":"2014-08-20","end":"2014-08-20","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"56621","start":"2014-08-22","end":"2014-08-22","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"25915","start":"2014-08-24","end":"2014-08-24","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"43782","start":"2014-08-26","end":"2014-08-26","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"},{"id":"2","title":"72648","start":"2014-08-28","end":"2014-08-28","allDay":"","editable":"1","repeat_i":"0","repeat_f":"2","repeat_e":"2023-04-13"}]
seams to me that each event should get a unique ID, no?