Meetings Disappeared

Two of my three recurring meetings have disappeared from my meeting schedule.   A few days ago, I updated all three recurring meetings to continue to 6/30.  They had just expired and I found them in previous meetings, and edited them to change the ending date.  Today I can only find one of them in either previous or upcoming meetings.

I don't have a list of all participants, let alone contact information, so it would be difficult to get a new meeting id/password to the participants.

Is there a way to retrieve and reinstate these meetings?