Result

	<li class="gig ng-scope">
		<div class="month september-2014">
			<h2>April</h2>
			<h3>2014</h3>
		</div>
		<div class="info-container">
			<div class="info">
				<div class="calendar">
					<div class="monthtop ng-binding">Apr
						<img ng-src="/dist/img/flags/GB.png" src="/dist/img/flags/GB.png">
					</div>
					<div class="day ng-binding">19</div>
				</div>
				<div class="text" ng-switch="" on="gig.status">
					<h1 class="ng-binding">Fabric <!-- ngSwitchWhen: cancelled --></h1>
					<h2 class="ng-binding"></h2>
					<h3 class="loc">
						<span ng-show="gig.city" class="ng-binding">London</span>
						<span ng-show="gig.country.name" class="ng-binding">, United Kingdom</span>
					</h3>
				</div>
			</div>
			<div class="actions">
				<span class="created">Created 13/03/13 at 3:30pm</span>
				<ul class="buttons">
					<li><a class="delete" href="">Delete</a></li>
					<li><a href="">Duplicate</a></li>
					<li><a href="">Edit</a></li>
				</ul>
			</div>
		</div>
	</li>
	
	<li class="gig ng-scope">
		<div class="month october-2014">
			<h2>April</h2>
			<h3>2014</h3>
		</div>
		<div class="info-container">
			<div class="info">
				<div class="calendar">
					<div class="monthtop ng-binding">Apr
						<img ng-src="/dist/img/flags/GB.png" src="/dist/img/flags/GB.png">
					</div>
					<div class="day ng-binding">19</div>
				</div>
				<div class="text" ng-switch="" on="gig.status">
					<h1 class="ng-binding">Fabric <!-- ngSwitchWhen: cancelled --></h1>
					<h2 class="ng-binding"></h2>
					<h3 class="loc">
						<span ng-show="gig.city" class="ng-binding">London</span>
						<span ng-show="gig.country.name" class="ng-binding">, United Kingdom</span>
					</h3>
				</div>
			</div>
			<div class="actions">
				<span class="created">Created 13/03/13 at 3:30pm</span>
				<ul class="buttons">
					<li><a class="delete" href="">Delete</a></li>
					<li><a href="">Duplicate</a></li>
					<li><a href="">Edit</a></li>
				</ul>
			</div>
		</div>
	</li>

Source

<script>

	$(document).ready(function(){

		$('.month').each(function(){

			//grab the classes
			var classes = $(this).attr('class').split(/\s+/);

			for (c in classes) {
				//only check against the date classes
				if (/\w*-\d{4}/.test(classes[c])) {
					//hide the other elements matching this date class
					$('.'+classes[c]).first().show();
				}
			}

		});

	});

</script>

thanks