Hi there,
It seems that you have enable 'Automatically Truncate Content ' at
backend>Components>EasySocial>Setting>Activity Stream and set it to truncate to 250 characters. It will truncate that content as your event's blog post content is set to shown 250 on this option "Content lengths to display in stream". It is either you disable 'Automatically Truncate Content' or increase those amount into higher number. By the way, i set those truncate to 500, and it shown shown correctly now. Please advice.