SPRINGFIELD Ill. (WAND) -- A very Happy Birthday to Illinois is in order. Hundreds gathered to commemorate the adoption of the constitution that took place back in 1818. Community members, tourists and even Governor Rauner, his wife and the Mayor of Springfield attended to celebrate the Bicentennial Plaza that they've been working on for months.  Marching Illini was there to open the event and was there to honor the state capitol.  The Bicentennial Plaza was created...