Search a calendar for Wordpress, should only show appointments whether busy or not

Hello everyone,
I am desperately looking for a calendar plugin for Wordpress that only shows the whole calendar with all days of the month, which courses are offered, how long they last and if they are occupied or still free. This is best marked with colors and next to the calendar there is a legend with the colors and what they mean.

There are soooo many calendar plugins. I have no overview, maybe someone here has an inspiration for me. It should only work rudimentary, it shows when courses are offered and if you are busy. No booking, no notification by email and all the fuss.

Thanks in advance for your help and effort.
Best regards,