By default Event Gallery places the uploaded images in the
images/eventgallery folder. You might want to change this. Have a look at the file
components/com_eventgallery/config.php. This file defines some constants. If you want to override some of those constants please create a file
config_override.php in the same folder and do your changes. Please be very careful with this! Don't change the
config.php file directly. It'll be overridden with every update.