I'm working to implement alerts via calendar events right now actually. I already have alerts based on web push, but frankly the web push notifications API suck

I'm working to implement alerts via calendar events right now actually. I already have alerts based on web push, but frankly the web push notifications API sucks. You only get the notifications on one device, they are delayed by random amounts of time (hours in some cases), the UI for enabling them is spammy and lame, and Safari doesn't support them. Calendar events suck too because there's no standard way to add an event to a system calendar across platforms. Even the same browser on different platforms acts differently.