Help! No idea what to wear to an Indian Wedding?

I'm attending an Indian wedding next week at a Temple and I have no idea what to wear that isn't indian clothing. I had bought this dress yesterday http://www.karenmillen.com/Colourblock-shift-dress/Dresses/karenmillen/fcp-product/903000056047 but was wondering if that was alright to wear? Also are strapless dresses okay or not? Thank you