If I have an unknown amount of identifiers sharing a specific naming-scheme, is there a way to grab them all at once using jQuery?
// These are the IDs I\'d          
        
The attribute starts-with selector ('^=) will work for your IDs, like this:
$("[id^=instance]").click(function() {
  //do stuff
});
However, consider giving your elements a common class, for instance (I crack myself up) .instance, and use that selector:
$(".instance").click(function() {
  //do stuff
});