Database table

Can I ask if the DB table for holding events is em_events, em_locations, etc ? I ask because I have just been given a web site by a client and it is not showing hundreds of old events which are stored in those tables. They do not have your plugin installed but another plugin for managing events. However, when I look inside the database the table name is not right for the installed plugin. Almost like they got completely confused and installed the wrong plugin when they had been using your one before.