Calendar spam ?

Im getting loads of messages regarding calendar events popping up on screen

not only to tell say today then ill get a reminder that the event like one hour away then 15min away then with 5 mins its driving me nuts ready for chucking my iPhone sick of it work for myself and this is causing me to check phone when it beeps then this crap pops up its stuck at the top of screen when I'm trying to use phone then have to up swipe it to get it off screen only to have it appear with a time reminder minutes later 😡😤🤬