Ask HN: How can I get full screen meeting reminders on a Mac?

I use google calendar and zoom for remote work, and I'm in a role with a lot of meetings. Embarrassingly, I'm showing up very late to a lot of them.

If I see a meeting coming up, I usually join early to avoid missing it. But if a meeting is running long into the next meeting, or if I forgot I had back-to-back meetings and go grab a snack or pick up a project, it can be 5-15 minutes before I notice I'm supposed to be there. I get notifications from my calendar in the top left of my screen, and sometimes coworkers remind me in slack, which also goes to a top left notification, but I'm effectively blind to these notifications when I'm working or talking to someone, so I'm looking for something that forces me to break focus.

I can't rely on audio being on or on having my phone on me. Ideally, I want a popup in the middle of my screen or a full screen takeover. Is there something I can run on my Mac that will do that for me?