I’ve actually been using Gemini on my phone to create appointments from details on my screen. For example, I have a delivery coming so there is an email with the date and time range. I can press and hold my power button and Gemini pops up. I press a button to use screen context. Then say, "put this in my calendar". Then it does. It isn’t perfect. Events that cross multiple days or odd location details in the description sometimes don’t get included. But that is more and more rare. I’m using an Android phone. So maybe that is why it seems to work. I do see that "mostly works" is not the same as "always works".

Also, if you are a Google Workspace customer, you can connect your workspace to the Gemini web app. It can then search and manipulate your calendar and your drive. It will also summarize documents and a few other tasks. I have less use for this but it is far from "it _can’t_ make appointments".