If you created you calendar (forex or signal calendar) and feel that it may be good for the members so send PM or message to moderator and your calendar will be visible for the public.

If you want for the events to be as private ones so you should deselect Public Event.
(Note: Private events are only displayed by invitation or after two days).
It may be news event and trading signal.

User may be invited by you to see your private event:
go to Messages and Invite User to see my private events.