Add times to talk listings on home page

[bcpierce00]

Each "talk box" at the bottom of the home page should show the next time that this event will be live.

[EdNutting]

These are showing content items, not events, and this page doesn't load in any events data. Organisers have the option of adding the schedule view to the home page if they choose to do so. (They can remove the tag list too if they like..)

Loading in the "next" time for content would potentially be possible - but we'd need to resolve the inevitable confusion caused by the fact that things like Posters often don't have a scheduled event and thus wouldn't display a time.