Yes, please, following for recommendations 🙏🏼

https://zapstore.dev/apps/naddr1qqgxxmmd9ehx7um5wf3kzmpwv9c8qq3qpatrlck0muvqevgytp4etpen0xsvrlw0hscp4qxgy40n852lqwwsxpqqqplqkjhc7d2

https://zapstore.dev/apps/naddr1qq8kxmmd9ecxcettw3hhxtnpwpcqygplwuxkt5a8vj5utj6s8tsj8e3wcavc45p4mqmw92qs7wrh5azmyspsgqqq0c9savs8q5

Tuta cal

davx (caldav) with https://github.com/FossifyOrg/Calendar

Most of apps are like that one and don't even warn users about the risk, unfortunately.

Just because many recommend Tuta: Tuta is garbage. Stay away. They have not been able to implement easy to ad features for over 2 years. Doesn't surprise when you look at their 'woke level'. They probably have other priorities. Go with Proton or self hosted Nextcloud.

Fossify calendar (+ DAVx5 if needed)