I have the same problem, like some other guys do: Organizer's name and venue are automatically added as events!!! Fortunately, they don't appear in calendar (front end).
I have events manager plugin installed (and previously used) but inactive.
other plugins, active and updated, that might be the cause are:
1. Types - Complete Solution for Custom Fields and Types
2. GD Custom Posts And Taxonomies Tools
thanks for your time!!!