Hi, Is there a Calendar app that has a synchronization option connected to a Wi-Fi network (only)?
In DavDroid you can choose to only sync over Wifi, if that helps you.
Calendars usually use Android API to sync data. Android, in turn, calls another adapter app to upload/download data to/from server.
I use AOSP Calendar with DAVdroid sync adapter. It has “Wi-Fi only” option.