Quick and dirty way to collect GA-events in one file. No, doesn't need jQuery. I'm just lazy at the moment.

ga-events.js

(function ($) {

  window.sw_ga = {};

  //
  // Events
  //
  sw_ga.events = [

    // Menu toggle
    {
      selector: '.menu-toggle',
      event: 'click',
      callback: function() { ga('send', 'event', { eventCategory: 'Menu', eventAction: 'Menu toggle button' }); }
    },

    // Newsletter focus
    {
      selector: '.newsletter input[type="text"]',
      event: 'focus',
      callback: function() { ga('send', 'event', { eventCategory: 'Newsletter', eventAction: 'Field focus' }); }
    },

    // Newsletter submit
    {
      selector: '.newsletter form',
      event: 'submit',
      callback: function() { ga('send', 'event', { eventCategory: 'Newsletter', eventAction: 'Form submit' }); }
    },
  ];


  //
  // Setup
  //
  sw_ga.setup = {

    // Init events
    init_events: function() {
      for (i = 0; i < sw_ga.events.length; i++) {
        var event = sw_ga.events[i];
        $(event.selector).on(event.event, event.callback);
      }
    }
  }


  // Init for realz
  jQuery(document).ready(function() {
    for (var fn in sw_ga.setup) {
      if (sw_ga.setup.hasOwnProperty(fn)) {
        sw_ga.setup[fn]();
      }
    }
  });


}(jQuery));