Samsung is Android. Android is Google. Their calendar is a Gmail calendar on the Gmail account you created when you activated your first Android device. Read this. https://support.mozilla.org/en-US/kb/using-lightning-google-calendar

Thanks. I've already read that. I should have mentioned that I'm trying to avoid using Google for anything. I have a Gmail account that I use to access the Play store, but that's about it. I think I'd rather try to have my phone with me when I'm sitting at my desktop, than use Google for this.

I've also read enough to know that Thunderbird isn't going to appear on Android anytime soon.

I guess what I really should have asked is what Android calendar app can I use that can be linked to Thunderbird. It's hard to believe that someone hasn't already figured this out. When I look at calendar apps on the Play Store, they typically don't say whether they use ICS, calDav, or WCAP format, which is what Thunderbird can connect to, I gather, and I'm not sure what is meant by "Location" for an app.

You phone calendar is Google so good luck in your quest.

You phone calendar is Google so good luck in your quest.

OK. But Google in what sense? Google produces Android software, and Samsung runs Android, so that makes everything running Samsung phones related to Google? How? Accessible to Google? Probably not - but I guess I could be wrong.

Google may have written the app that Samsung gives you to use as a calendar, and I guess it's possible that they left themselves a back door into it. Or maybe Samsung wrote the app themselves or had the app written for them by a third party. I've never seen any discussion on this.

However, the way that the Samsung app talks to other calendars is through my Samsung account, not through Gmail. I took the trouble to delete the Gmail connection in my Calendar setup. Does that leave Google out of the picture? Can't be absolutely positive, but it makes it much less likely.

So perhaps there is third party calendar app that would connect through my personal email account?

Go to gmail.com and log into your account. Click the cube made up of 9 squares to go to apps. Check the calendar. When I do that all events I enter on my Samsung phone or Shield tablet are there and I never enter a thing at the Gmail site or even view the calendar there.

Please explain how you unlinked the calendar on you Samsung device. Samsung is pretty clear that it is a Gmail linked calendar. http://techlife.samsung.com/tips-tricks-managing-phones-calendar-1493.html

OK. I tried the "Go to Gmail.com...". It took me into an account which I've never used before and offered to set things up for me. I declined. I clicked on the 9 square boxes to open the calendar app, and it gave me a welcome type message. The calendar was blank.

I conclude that my calendar is not connected in any fashion to Gmail.

The calendar on my Samsung phone has 3-4 items per day, average, since my wife and I share it.

It's not that I unlinked it, it's that I'm using a different account to connect it. Sorry if I was not accurate, but I didn't have the phone in front of me then. Essentially what I did was to open the calendar app, go to the triple dot menu on the upper right, and select the option "Calendars". That gives you an option to work with different calendars. One of the 'accounts' listed there is my Samsung account, which is shown as my Verizon e-mail account, and under that account are two boxes called "Samsung Calendar" and "Samsung Tasks". Both of the boxes in those two lines are checked. There is a Gmail account listed also, but that box is NOT checked. and in fact none of the other possibilities is checked. When you 'add' an account, one of the options is a "Samsung" account, which is why I described it as connecting through my Samsung account. Samsung uses my Verizon e-mail as a username for their account.

You are going to have to link lightning with some cloud based calendar. I guess you need to learn who or what the Samsung Calendar is and see what it takes to sync to it. Some applications use caldav but I am not going to guess what you have setup.

Yep. Thanks for your help and your comments.