Does it protect sensitive events?
Changing a calendar entry always requires your approval. Before the assistant creates, moves, or cancels anything on your calendar, it shows you what it proposes and waits — that is enforced in the system itself, not left to the assistant's judgement. When it isn't sure whether something is sensitive, it surfaces the decision to you rather than guessing.
It does not change an event's visibility. Whether an entry is public, private, or default in Google Calendar stays exactly as you set it — Lonzo reads that setting and never writes it. If you want an entry marked private, set it in Google Calendar.
Lonzo also does not contact anyone else about your calendar. Reaching out to other people on your behalf isn't part of the current release, so nothing is disclosed to a third party for you to have to protect.
See also: How does it keep things confidential? · What does it ask before doing?