Tax day is the 17th this year because the 15th falls on a Sunday. But I think most people still associate April 15th as tax day.
You could do a game with Monopoly money. Maybe the thing where you have them ask you questions about your job and they get $$ for every question? My HGP lady gives $$ for several things...RSVP, bring a guest, follow theme, ask questions during the show, answering questions during the show. Then she does an auction for a couple small gifts at the end.
I'd think anything that has to do with taxes and money would be good! You could also say something about turning that tax refund into a greater return by starting your own PC biz!
Michelle