danimalSK - 8:54 pm on Jan 27, 2012 (gmt 0)
These are not rich snippets. Look at coldplay . com (the above example). For starters there are no events on the root page at all. Now look at the live page (/live.php). Not only is there no markup on this page, but also there is no mention of vividseats, viagogo etc in the source code (the links point elsewhere).
This looks a lot more similar to the mechanism used for deduping places and linking to local reviews (e.g. pulling reviews from trusted sources like Yelp, Zagat, urbanspoon).