I'm not sure whether a <section>
-element is the right wrapper for this container. The specs on w3.org say:
A section, in this context, is a thematic grouping of content, typically with a heading.
In the example markup, you don't have a heading, which could be added, but I don't think, that the date itself "is a thematic grouping of content", it is more a meta information to some other content.
Regarding the <time>
-elements another way to write this thingy could be:
<div>London</div>
<time datetime="P2D">20 - 21</time>
<time datetime="2013-02-20">Feburary 2013</time>
<div>24 days to go</div>
The first one describes a duration of two days, which the event will last. The second specifies the day the event starts. Without the tags it still reads "London 20 - 21 February 2013 24 days to go".
You can read more about it here on w3.org: