As Johnathon mentioned, the future really belongs to microdata format, because it's the part of the new HTML5. I highly recommend to use this format.
I believe that this is the even rich snippet, which have you showed in your post. You can implement your event rich snippet like this:
<div itemscope itemtype="http://data-vocabulary.org/Event">
<a href="http://www.example.com/events/spinaltap" itemprop="url" >
<span itemprop="summary">Spinal Tap</span>
</a>
<img itemprop="photo" src="spinal_tap.jpg" />
<span itemprop="description">After their highly-publicized search for a new drummer,
Spinal Tap kicks off their latest comeback tour with a San
Francisco show.</span>
When:
<time itemprop="startDate" datetime="2015-10-15T19:00-08:00">Oct 15, 7:00PM</time>—
<time itemprop="endDate" datetime="2015-10-15T19:00-08:00">Oct 15, 9:00PM</time>
Where:
<span itemprop="location" itemscope itemtype="http://data-vocabulary.org/Organization">
<span itemprop="name">Warfield Theatre</span>
<span itemprop="address" itemscope itemtype="http://data-vocabulary.org/Address">
<span itemprop="street-address">982 Market St</span>,
<span itemprop="locality">San Francisco</span>,
<span itemprop="region">CA</span>
</span>
<span itemprop="geo" itemscope itemtype="http://data-vocabulary.org/Geo">
<meta itemprop="latitude" content="37.774929" />
<meta itemprop="longitude" content="-122.419416" />
</span>
</span>
Category: <span itemprop="eventType">Concert</span>
<span itemprop="ticketAggregate" itemscope itemtype="http://data-vocabulary.org/Offer-aggregate">
Tickets from $<span itemprop="lowPrice">10.00</span>-$<span itemprop="highPrice">11.00</span>
<span itemprop="currency" content="USD" />
<span itemprop="offerCount">2,000</span> tickets available
<a href="http://www.example.com/events/spinaltap/alltickets" itemprop="offerurl">
http://google.com/ticket</span>See all available tickets</a>
</span>
<span itemprop="tickets" itemscope itemtype="http://data-vocabulary.org/Offer">
<a href="http://www.example.com/events/spinaltap/presale" itemprop="offerurl">Presale tickets</a>
<span itemprop="price">$10</span><span itemprop="currency" content="USD" />
till <time itemprop="priceValidUntil" datetime="2015-11-10">10 November 2015</time>
(<span itemprop="quantity">1000</span> available)
</span>
<span itemprop="tickets" itemscope itemtype="http://data-vocabulary.org/Offer">
<a href="http://www.example.com/events/spinaltap/tickets" itemprop="offerurl">Full-price tickets</a>
<span itemprop="price">$11</span><span itemprop="currency" content="USD" />
</span>
</div>
If you still having problems, then take a look at this Google article http://support.google.com/webmasters/bin/answer.py?hl=en&answer=164506&topic=1088474&ctx=topic.
To know more about rich snippets, what are they, what are they useful for and what type of rich snippets exist, check my article at http://blog.victorlava.com/what-is-a-rich-snippet-everything/.