Hi for my 13th party I had a karaoke party, I gave everyone invitations stuck onto CDs (adverts etc) and asked them to prepare in groups or solo a song of their choice. On the night they had to come dressed as their characters. I built a little stage just to give the atmosphere.  They came and every one was given a score sheet where they wrote which group they thought sang, danced and dressed the best. every one performed it wos sooo fun. we went to eat snacks while my mum was totaling the scores. At the end of the party the winners were announced and given a small prize and certificate it was wicked!