Adding interest groups to Events Manager form

Hi,
I’ve been successful in adding a subscribe checkbox to the Events Manager registration form, however I cannot get it to work with interest groups.
I have tried adding checkboxes as suggested in the FAQ however it does not seem to work.
To get it to play nice with Events Manager I have had to hardcode the checkbox into the EM template.

This is the mark up I’m using:

<?php
				if ( is_user_logged_in() ) {
					echo '';
				} else {
					echo '<div id="mc4wp-checkbox"><label><input type="checkbox" name="mc4wp-subscribe" value="1" checked="checked" /> Subscribe to our newsletter?</label>

<select>
  <option value="" disabled selected>Select your region</option>
  <option value="8" name="mc4wp-GROUPINGS[7601][8]" id="mce-group[7601]-7601-0">Brisbane</option>
  <option value="16" name="mc4wp-GROUPINGS[7601][16]" id="mce-group[7601]-7601-1">Gold Coast</option>
  <option value="32" name="mc4wp-GROUPINGS[7601][32]" id="mce-group[7601]-7601-2">Sunshine Coast</option>
  <option value="64" name="mc4wp-GROUPINGS[7601][64]" id="mce-group[7601]-7601-3">Perth</option>
</select>
</div>';
				}

			?>

I’ve tried a few different options with this i.e. not having the mc4wp in the name adding mc4wp to the id etc.

I also tried using multiple checkboxes instead of a select list.
markup below:

<label><input type="checkbox" name="GROUPINGS[Gold Coast][]" value="Gold Coast" /> Gold Coast</label>
<label><input type="checkbox" name="GROUPINGS[Brisbane][]" value="Brisbane" /> Brisbane</label>
<label><input type="checkbox" name="GROUPINGS[Sunshine Coast][]" value="Sunshine Coast" /> Sunshine Coast</label>
<label><input type="checkbox" name="GROUPINGS[Perth][]" value="Perth" /> Perth</label>

If you can help in anyway that’d be brilliant.

Thanks

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