Hey! I know I'm replying really late. You can, of course, organize the Dandiya Night on this Friday or Saturday. You can have the dress code decided. You can have prizes for the best-dressed male & female, best dandiyas, best dancer male & female.
Even before the Navratri starts, you can actually send a mail mentioning that the dress code for these 9 days is Indian ethnic and colors for each day, as each day has some significance. I have observed ladies following a particular pattern in terms of color preference. Hope this helps you. Enjoy!!
Regards,
Sandy