I miss meetings a lot less frequently now.
My suggestion is to get a smartwatch if you don’t have one; I use a Garmin. For meetings set a 15 min alarm and conference calls set a custom 2 min. Check a couple times a week and click through your calendar items to make sure alarms are set properly, takes about 30 seconds a week.
I still miss some calls because I’m weird when I focus on something, but it helps a lot. Note that for awhile I was getting too many arm buzzes so I started to adapt. It’s important to turn off Twitter and email notifications etc.
Hope this helps.