You need the SO game pack available on that web site, or alternatively, the game emulator Gens+ and a Sonic 2 or Sonic & Knuckles ROM, both of which we can give you. You don't have to install anything, just copy it to your computer, and if need be you can delete it when the competition's over.
If your dad's really concerned and doesn't find the notion of Internet people disconcerting, I can give you my cell number if that'd help. XD
edit: also I forgot CF doesn't have any events anymore. :o zomg britbackup yay!