For having a bunch of leftover materials and doing it in a rather short amount of time, you certainly breathe new life into the classics!
Any idea what sort of charity events you might participate in? Something that comes to mind that I saw in today's newspaper is the Medibank Melbourne Marathon Festival, since there are people who dress up as superheroes and such and run for charity.
Just whatever you do, if you do decide to check it out... don't run the 7am marathon, that's 42 kilometres (or around 25-30 miles) of running in high heels!
My thoughts aside, keep up the amazing crafts(wo)manship!