Yes it has been discussed various times in the forum and the solution is also found in our FAQ section Xiaomi did some (questionable?) branding with their Android version...
Here we go: https://www.davdroid.com/faq/automatic-synchronization-is-not-run-as-expected/
Look at the Autostart section...
Does this solution work for you?
Modern open-source Android app to add/import/subscribe your .ics/iCal calendar files
Hi! It doesn't make much sense to also copy LOCATION and DESCRIPTION, I think. Copying the SUMMARY has a practical outcome for the user because of the display in the calendar not being "---" anymore. Isn't it enough to solve the problem just by copying the SUMMARY field?
The firewall solution would certainly work on a trusted LAN, thanks for the suggestion. As a proof of concept GfxTablet definitely succeeds in demonstrating that we have are carrying functional drawing tablets around with us every day. Thanks!