This app was mentioned in 35 comments, with an average of 1.83 upvotes
Any calendar app will do, just remove its internet access and it should work fine.
I recommend https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar and their other amazing apps (can get all PRO versions on F-Droid for free) https://www.simplemobiletools.com/
Just in case it's of use "Simple Calendar" HAS the contacts permission but, importantly if you value privacy, has NO internet connectivity. So you're contacts will stay local on your phone. https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar.pro
I just found two apps, by the same developer. I had the first one installed and in use. They both seam to be free though, even if the second one has "Pro" in its name. Try them out
You might try this, and if it works for you, consider the "Pro" version.
https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
I use the Pro version of the calendar app, and other apps of theirs as well.
DG
I guess Simple Calendar would do your job. I have the pro version and it works great. The app is offline and doesn't ask for unnecessary permissions either. https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
Try Simple Calendar. I don't personally use this app but I've seen that it can import/export ics. Or, really any of the various calendar apps should offer same function. Business Calendar is another popular one, but it's a paid app.
I use Simple Calendar, and it's got a nice transparent widget.
I like this group of simple apps, no frills, no ads. http://www.simplemobiletools.com
https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
I use Simple Calendar for my calendar app
the link might direct to the pro version, but there is a free version
Try simple calendar https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
J'aime bien Simple Calendar, c'est open-source, ça vient d'une suite bureautique pour Android qui se veut simple et open-source. Les versions pro sont gratuites si tu les télécharges depuis GitHub ou F-Droid.
Edit Bonus : il y a aussi ce site, AlternativeTo, que je recommande, il permet de rapidement trouver des alternatives.
I like to use Simple calendar and OpenTasks with DAVDroid for syncing. You can get the last one for free on fdroid, link.
The SimpleCalendar app for Android doesn't sync by default and it is FOSS.
https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
3 mb app code is online you can build your own apk also https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
Simple Calendar by Simple Mobile Tools
Simple Calendar by Simple mobile tools
There's an app named..uh.. simple calendar.
https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar
Simple Calendar (Also on fdroid)
https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar&hl=en
Owncloud and Simple Calendar and Simple Contacts.
https://play.google.com/store/apps/details?id=com.simplemobiletools.calendar&hl=es
https://play.google.com/store/apps/details?id=com.simplemobiletools.contacts&hl=es