Multiple post type in one calender

Is there any possibility of putting multiple post type to a calender or if can’t can i put 2 calender on a same webpage.
I have tried few ways but i cant make it.
I got Courses and Event, and i planned to put both into the calender. Moreover, when i try to put 2 calender in a same webpage, it doesn’t work and only 1 will shown.

** once i updated the plugin, the calender can’t even show.

Appreciate for helps.

https://www.ads-software.com/plugins/wp-fullcalendar/