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The site relaunch is an event that happens on the NaNoWriMo website in October. It is when the forums are wiped for a new season of Nano and is considered the "start" of the new season.
Every year, the forums are wiped to give them a clean start without the clutter of previous years (the posts are kept in a database, to be added to the website as a read-only archive). In addition, a new Breaking News and NaNoVideo are put out to welcome users to the site. The forums in December and Beyond are also removed completely (until December). The store is updated with new information on the donor goodies, and users who had halos from the previous season of Nano will have them reset.
In addition, major changes are often implemented during the site relaunch. The switch to Xoops, Drupal, and later Ruby on Rails was implemented during the site launch. New forums may be added, or old forums with no further use may be removed, and new or changed features may be added to allow them to be tested with some significant traffic before the actual start of Nano. New merchandise may be added at this time in preparation for the new season as well. The Office of Letters and Light also sends out reminders of the new season to anyone who hasn't logged in since a certain date. The exact date used is currently unknown.
The Young Writers Program also relaunches around the same time. Camp NaNo's 2012 Relaunch was in January; 2013's was in April. Before Discontinuation, The SF relaunch was in late february or early march.