I have a few sites that are used exclusively to promote live events (ex. tradeshows, conference, etc). In most cases these sites content fewer than 100 pages and include information for the upcoming event with links to register. Some time after the event has ended, we would redesign the site and start promoting next years event...essentially starting over with a new site (same domain). We understand the value that many of these past event pages have for users who are looking for info from the past event and we're looking for advice on how best to archive this content to preserve for SEO. We tend to use concise urls for pages on these sites. Ex. www.event.com/agenda or www.event.com/speakers. What are your thoughts on archiving the content from these pages so we can reuse the url with content for the new event? My first thought is to put these pages into an archive, like www.event.com/2015/speakers. Is there a better way to do this to preserve the SEO value of this content?