Lots of people have asked about appropriate attire for this auspicious occasion. Here's a basic guide to help you pack:
For the Mehendi (Henna): Casual. Dress for comfort!
For the Sangeet/Badchan: Festive cocktail attire.
For the Wedding/Reception: Ladies- if you've got a sparkly dress hanging in your closet waiting for an occasion, now's the time! Gentlemen- suit is appropriate.