CalDav server (Baikal or anything similar, even Synology DSM has an app for it if you have a NAS), plus Davx5 if you're on Android, plus Simple Calendar.
Porkbun
CalDav server (Baikal or anything similar, even Synology DSM has an app for it if you have a NAS), plus Davx5 if you're on Android, plus Simple Calendar.