This may or may not be a housekeeping tidy-up issue... I went looking for the 'Report this Event' language string.. I found 2:

COM_EASYSOCIAL_EVENTS_REPORT_EVENT
COM_EASYSOCIAL_EVENTS_REPORT_THIS_EVENT

I'm not sure if they are used in different places for good reason. I did an override using the first one and that works fine where I wanted it... so just reporting the second one incase it's surplus to requirements.