I have the same kind of issue... After struggling for 2 days to get the calendar pushed to the reMarkable, I finaly managed to get it, but completely empty! None of the events appears on the reMarkable while in the App, it is mentionned that a number of events have been imported from one of the synced calendars. I added some events, re-synced the calendars and... no new event was imported and when regenerating and re-syncing with the reMarkabble, still nothing is shown. Has anybody an idea for a solution to get the events shown on the reMarkable? So far I did not try to add events on the reMarkable planner to see if it would sync with my calendars...

Thank you Michael and Jason. I tried that already after reading on the forum that it would indeed be an issue to have them both running at the same time, but it didn't work. Then, I found out that a new version (1.0.17) was out and I dowloaded it and... manged to get it installed! Don't ask me how, I did nothing different, but this time it worked. I know have both applications installed and working (as far as I can see!). I could create a planner, but can't see it yet on the device... I guess I still have to learn how to ! It will be my mission of the day! ;-)