Using Classic Outlook on Windows for personal email, calendar, and contact management
I was in the same situation. I was the meeting owner, the meeting mysteriously disappeared from my calendar, I couldn't see it but everyone else could. When they forwarded it to me, I couldn't see it, respond or make any changes.
I found a solution that worked!
I went to my colleague's calendar (whose calendar I can see all their details) and downloaded the event (including full series) as an .ics file. (if you can't see the details, you can ask your colleague to download the ics file and send to you). I then manually imported the file into my Outlook with these steps:
From Outlook calendar > File > Open & Export > Import/Export > Import an iCalendar (.ics) or vCalendar file (.vcs)
This did the trick, it was back on my calendar in full and I was able to make changes.