Wharton Global High School Investment Competition is an investment simulation competition, especially useful in the absence of the Student Investor Challenge again this year. It's a bit more involved than SIC (but I quite like it!) - students are given the case study of Nichole Jordan, a young exec with a number of short- and long-term financial aims, and must decide how best to invest a portfolio of $100,000.
Registration deadline is Sat 18th September so you'll need to get your skates on for this one