Alerts appeared on calendar that I’m not subscribed to

I was checking my calendar and. Notice warning alerts that I hadn’t subscribed to. It says final warning all your photos will be removed and in the notes there’s a link for payment and storage. Then there’s another alert saying:-hidden risks could be on you iCloud set up. With a link etc in the notes. I haven’t opened the links and I’ve went into my calendar app to see if there was a suspicious calendar linked to mine and there isn’t. These alerts are set on my calendar for a full year from 26th Oct. Can someone please help me?