[HHalvi]

I use Fantastical 3 which not just puts a calendar in your menu bar but also solves for most (if not all) of your calendaring needs. All of it for ~40$ a year which allows you to use it also on your Mac, iPhone, iPad and Apple Watch.

P.S: Not affiliated with Fantastical in any way, just a happy and paying user for a few years now.

[andrewmin]

Fantastical also has a great click-to-join button. When I first saw this, I thought the post was someone who discovered that feature... it's the same feature.

[maxekman]

Fantastical really is fantastical! The quick entry and great integrations makes it truly great. It also has a really good menu bar item similar to this project.