My daughter was able to graduate early from her UC in December, 2011. Her commencement will be June, 2012. We are having the party in June but I want to recognize and celebrate her as a December, 2011 Grad. Is it okay to put this information on annoucement/party invitation and use 2011 decorations?
Would read:

Class of 2011
(School & Degree information)
Commencement Ceremony
June 2012