What are the odds, wrote this blog exactly 5 years ago,to the day, http://blog.kookoo.in/2012/04/wedding-ivr.html
This was built using KooKoo, the Twilio for India and is more of an IVR rather than SMS as India is a voice friendly country, and who does not like to hear the invite in the groom's own voice :)
Its got options for directions etc too, people always seem to call to know the directions to marriage hall :)