Method to find a hook

Here in this page its the list of all action and filter hooks, just click on one and it will tell you in which file you can find it, a partial view of where is declared, and below are the related hooks.

you can see a list of hooks and the functions attached to it using:

$hook_name="wp_head";
global $wp_filter;
var_dump( $wp_filter[$hook_name] );

i am using ‘wp_head’ as an example, but you can use a hook related to the event (you said location) and start digging, for known events you can just do a google search, the common ones will show, and you can use them as $hook_name