Join the Mosaic - 2009 VG was released on:
USA: 2009
Join In - 2013 was released on: USA: 1 August 2013 (internet)
Join the Circus - 1923 was released on: USA: 2 December 1923
Lonelygirl15 - 2006 Join Me was released on: USA: 23 September 2007
Join the Military - 2006 was released on: USA: 18 July 2006 (internet)
Join the Land Army - 1918 was released on: USA: 6 April 1918
Let's Join Joanie - 1950 TV was released on: USA: 1950
The Wonder Pets - 2006 Join the Circus was released on: USA: 2009
The actual join date of Duke of URL isn't specified on its bio page, but its release was sometime around May of 2009.
Join the Resistance Fall in Love - 2003 was released on: USA: 2003 (IFilm.com)
Join Us - 2007 was released on: USA: 23 June 2007 (Los Angeles Film Festival)
Bud and Susie Join the Tecs - 1920 was released on: USA: 28 November 1920
Pingu - 1986 Pingu Is Not Allowed to Join was released on: USA: 30 June 2006