Proton Meet is currently in the works.

However, if any of Proton Meets developers see this, I hope they include the Proton Meets meeting code link into Proton Calendar.

Currently, Proton Calendar only allows for Zoom links to be attached to events.

New Product Idea: Proton Meet
A secure, encrypted video meeting platform integrated with Proton Mail and Calendar. Similar to Zoom, but privacy-focused, ensuring no spying on users like with Teams or Google Meet. Perfect for confidential meetings with full end-to-end encryption.

Announcement: Proton released Proton Meet quietly without any email, blog post or update here

Test beta: https://meet.proton.me/
Information: https://proton.me/meet

EDIT: Sorry, I realise I was wrong. Only Lifetime, Visionary and Enterprise users can access it. Apologies.
Screenshots here: https://drive.proton.me/urls/AXRH89JFS4#3UEMoV3yYKwU

Yes, it was an odd way to release. I stumbled across it and had to work out what was going on apart from a minimalist single page.

Exactly. If the Proton suite included that meeting feature, a browser, and a messenger, it would be perfect. I know there are alternatives, such as Zoom for meetings, Mozilla for browsing, and other options for messaging, but using everything in a single trusted platform is better for me.

Exactly, privacy-first meetings would fit perfectly into Proton’s ecosystem.

For Proton Business customers this is most likely a very important feature as this is included in most other 'Business suite' SaaS software on the market.

In the interim I recommend looking at brave talk. No you don’t need the brave browser to use it. There is a chrome extension available for it that works with proton calendar as well

I think using Jitsi Meet would be a viable alternative.

If Proton continues to grow its userbase and financial prospectus, this might eventually happen. However, realtime videostream encryption/decryption without significant lag in a global market requires daunting processing power and expert network engineering. I am not in the know on this, but I think Proton's data infrastructure won't be up to the task for months or years yet.
It also puts them in direct competition in that market with Google, Zoom, and Brave who is currently allowing Proton as an advertising client.
I would like to see this happen, but as of this writing, it looks way down the roadmap.

It would be amazing if you could run Jitsi Meet (https://jitsi.org/jitsi-meet/) for your users. Then integrate this with calendar etc.

This idea is really amazing and should be implemented. I can't understand your lack of effort.
Proton Browser
Proton Messenger
Proton Meet should be created.

Need something I can easily set meetings on my mail environment

Interesting idea, an APK like meet and zoom.

It would be really helpful to be able to set up a Google Meet event within the Proton Calendar OR even have a Proton version of Meet which would feel even more secure!