Hi there Youna. Thanks for the note here, and for the follow-up with that link. I am seeing the issue on your site; but it looks like the country functionality as a whole is not behaving as it should. Check out how that country selector is supposed to appear: .
Are you running Events Calendar PRO? If so, that allows you to set default venue information under Settings -> The Events Calendar, so the best route may just be to enable that if you’ve got it. That would allow you to have the country pre-selected (though a user could still change it as they saw fit).
As for the initial problem, though…you said that it doesn’t appear to be a plugin conflict, but what about the theme? Are you in a position where you can test reverting to the default 2011 theme, ideally with no other plugins active? Also, please confirm whether or not you’ve modified any of the calendar’s templates so far…and lastly, that you’re running Events 2.0.6.
We’ll try and troubleshoot accordingly for you from there. Thanks in advance!