Android open source calendar
I think The Etar Calendar might work. It's the preinstalled calendar for /e/ (I haven't tried sharing it with people but you can have an online calendar and it tells me there is an option to be "busy" during times, so I assume it works).
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Calendar app like the LG calendar app?
1 project | reddit.com/r/androidapps | 31 Mar 2022
Is there any advantage to using the pre-installed calendar compared to installing Etar from fdroid?
1 project | reddit.com/r/CalyxOS | 15 Mar 2022
[new app][dev] CalEF: Send Calendar entry
3 projects | reddit.com/r/androidapps | 22 Jan 2022
Hisense A5 Calendar recommendation?
1 project | reddit.com/r/eink | 8 Jan 2022
Need stock lineage Calendar
1 project | reddit.com/r/LineageOS | 23 Jul 2021