Hi,I guess your event is successed created,but create_time error,too larger or smaller.
it reason may be you Language Time Format it not matched for system.
check the file: opengoo/language/ru_ru/lang.js ,in lines:407
change line
FROM:
'date format': 'd/m/Y',
TO:
'date format': 'm/d/Y',
Then Reload the Page .