I am very pleased that I have, successfully, connected the native calendar application on Linux Mint with the Disroot cloud. Although I was able to connect my (rhymes with)"Droogle" calendar, I was not able to connect someone else's calendar that was shared with me. I don't see it, but "whatever."
I also found a GNOME contacts application and connected my contacts list on Disroot. It works so well! Even the performance is faster on my end. Huzzah!