I use BC2 myself, and notifications of created events are surely working here. So we’d need more verbose steps to reproduce the problem. Or just stay with CalDAV Sync if you want less efforts.
"E/A-Error: Cannot verify hostname" Owncloud + Android 5.0
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My Config
https://
liberty42.de/owncloud/remote.php/caldav/Problem
The error message after pressing the “forward”-Button:
“E/A-Error: Cannot verify hostname: liberty42.de”Server Specs:
- Own Root Server
- Debian Wheezy
- OwnCloud 7.0
- StartSSL Certificate with RSA4096 and SHA-512 for liberty42.de
Phone Specs
- Nexus 5
- Android 5.0
Background
I considered to switch from CalDAV-Sync and CardDAV-Sync because your app is available via F-Droid and is FLOSS. Two very important arguments to prefer DAVdroid
However, I had to switch back to CalDAV-Sync and CardDAV-Sync because DAVdroid is not working for me 
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Please install the certificate as described in the StartSSL manual - the intermediate certificate is missing and the chain thus invalid.
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Congratulations to fixing it