Proton Calendar Reminders
I find Google calendar's Reminders feature very useful, as opposed to having to create a whole event every time like I do in Proton Calendar currently.
It could just send a device notification with the title of the reminder at a specified time and allow me to click "Completed" or "Snooze for (insert time)". Perfect for reminding myself to call someone back in an hour or pick up my dry cleaning at 4pm!

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Zachary Maddox commented
I really want this feature. I really miss it from Google Calendar. I need to be able to set simple reminders, with notifications when they are due. I also need reoccurrence features. As a software dev, this seems like it should be a pretty easy feature to build on top of the existing events in Proton Calendar.
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Martin Barilík commented
The only one thing that keeps me from getting off of google services, completelly ...
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Hotep Wombat commented
This is hugely important and would be a great feature to have. It's actually stopping me getting off Google, as I use it A LOT!!